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The ISO by Castle

3.5 star property
Beachfront, with outdoor pool

Choose dates to view prices

Photo gallery for The ISO by Castle

Outdoor pool
Beach House Suite (2nd floor) | Balcony view
Exterior
One Bedroom Ocean View (2nd Floor) | Private kitchenette | Fridge, coffee/tea maker
Ocean View (1st - 3rd Upper Floors) | 1 bedroom, laptop workspace, blackout drapes, Internet

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning

Room options

Available filters for rooms
Showing 7 of 7 rooms

View all photos for Ocean Front View (1st - 3rd Upper Floors)

1 bedroom, laptop workspace, blackout drapes, Internet

Ocean Front View (1st - 3rd Upper Floors)

7.8 out of 10
Good
(30 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Separate bedroom
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean View Deluxe Room (2nd Floor)

Ocean View Deluxe Room (2nd Floor) | Living area | 42-inch flat-screen TV with cable channels, TV

Ocean View Deluxe Room (2nd Floor)

7.8 out of 10
Good
(14 reviews)

Highlights

Balcony
Separate sitting area
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
  • 290 sq ft
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors)

Partial Ocean/Pool View (1st - 2nd Upper Floors) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors)

10.0 out of 10
Exceptional
(4 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Separate bedroom
  • 290 sq ft
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean View (1st - 3rd Upper Floors)

Ocean View (1st - 3rd Upper Floors) | 1 bedroom, laptop workspace, blackout drapes, Internet

Ocean View (1st - 3rd Upper Floors)

8.6 out of 10
Excellent
(62 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Separate bedroom
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Beach House Suite (2nd floor)

Beach House Suite (2nd floor) | Living area | 42-inch flat-screen TV with cable channels, TV

Beach House Suite (2nd floor)

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchen
Refrigerator
Dishwasher
  • 640 sq ft
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for One Bedroom Ocean View (2nd Floor)

One Bedroom Ocean View (2nd Floor) | Private kitchenette | Fridge, coffee/tea maker

One Bedroom Ocean View (2nd Floor)

9.0 out of 10
Wonderful
(2 reviews)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchenette
Refrigerator
Flat-screen TV
  • 580 sq ft
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

1 bedroom, laptop workspace, blackout drapes, Internet

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Separate bedroom
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 1 King Bed

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About the neighborhood

Map
4-796 Kuhio Hwy, Kapaa, HI, 96746

What's nearby

  • Waipouli Beach - 3 min walk - 0.2 miles
  • Coconut Marketplace - 14 min walk - 0.7 miles
  • Lae Nani Beach - 3 min drive - 1.0 mile
  • Kapa'a Beach Park - 4 min drive - 1.7 miles
  • Smith's Tropical Paradise - 6 min drive - 1.9 miles

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪Island Country Markets #93 - ‬16 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪Lava Lava Beach Club - Kauai - ‬3 min drive
  • ‪Tropical Dreams Hawaiian Gourmet Ice Cream - ‬7 min walk
  • ‪Burger King - ‬18 min walk

About this property

The ISO by Castle

Resort located in Waipouli
Take advantage of a garden, a bar, and a restaurant at The ISO by Castle. This resort is a great place to bask in the sun with a white sand beach, beachfront dining, and snorkeling.
Other perks at this resort include:
  • An outdoor pool
  • Bike rentals, smoke-free premises, and a water dispenser
  • Guest reviews speak highly of the beach locale, pool, and helpful staff
Room features
All 78 rooms have comforts such as laptop-friendly workspaces and air conditioning, as well as thoughtful touches like high-speed internet. Guest reviews speak positively of the clean rooms at the property.
Other conveniences in all rooms include:
  • Bathrooms with shower/tub combinations and free toiletries
  • 42-inch flat-screen TVs with cable channels
  • Wardrobes/closets, balconies, and refrigerators

Languages

English

Similar properties

Balcony

Aston Islander on the Beach

  • Pool
  • Air conditioning
  • Bar
  • Laundry
8.6 out of 10, Excellent, 1,007 reviews
$181 nightly
The price is $214
Aug 13 - Aug 14
Total includes taxes and fees
Aston Islander on the Beach

Property amenities

Internet

  • Available in all rooms: High-speed internet

Food and drink

  • A bar/lounge
  • A restaurant

Restaurants on site

  • The Bullshed Restaurant

Things to do

  • Bicycle rentals
  • Outdoor pool
  • Snorkeling
  • Yoga classes

Family friendly

  • In-room refrigerator
  • Outdoor pool

Conveniences

  • Limited-hour front desk
  • Water dispenser

Outdoors

  • Garden
  • On the beach

Accessibility

  • No elevator

More

  • 3 floors
  • 5 buildings
  • Smoking not allowed
  • Water dispenser usage encouraged

Room amenities

Bedroom

  • Bedsheets provided
  • Blackout drapes

Bathroom

  • Free toiletries
  • Private bathroom
  • Shower/bathtub combination
  • Towels provided

Entertainment

  • 42-inch flat-screen TV with cable channels

Food and drink

  • Coffee/tea maker
  • Refrigerator

More

  • Air conditioning
  • Ceiling fan
  • Laptop workspace

Policies

Check-in

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
Minimum check-in age: 18

Check-out

Check-out before 11 AM
Late check-out subject to availability
A late check-out fee will be charged

Special check-in instructions

The front desk is open daily from 7:00 AM - 10:00 PM
Front desk staffed during limited hours

Access methods

Front desk (limited hours)

Pets

Pets not allowed

Children and extra beds

Children are welcome
Rollaway/extra beds are not available

Property payment types

Important information

Fees

You'll be asked to pay the following charges at the property. Fees may include applicable taxes:

  • Resort fee: USD 35.38 per accommodation, per night
The resort fee includes:
  • Additional inclusions
  • Fitness/yoga classes
  • Newspaper
  • Parking
  • Self parking
  • WiFi access (may be limited)

We have included all charges provided to us by the property.

Optional extras

  • Late check-out is available for a fee (subject to availability)

The above list may not be comprehensive. Fees and deposits may not include tax and are subject to change.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card, or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Tax ID - W-34434930-01
This property accepts credit cards and debit cards; cash is not accepted
Safety features at this property include a smoke detector
This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children; if you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room

We should mention

This property does not have elevators
Only registered guests are allowed in the guestrooms

Property is also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

Frequently asked questions

Does The ISO by Castle have a pool?

Yes, this property has an outdoor pool.

How much does it cost to stay at The ISO by Castle?

As of Jul 15, 2025, prices found for a 1-night stay for 2 adults at The ISO by Castle on Jul 20, 2025 start from $269.49, excluding taxes and fees. This price is based on the lowest nightly price found in the last 24 hours for stays in the next 30 days. Prices are subject to change. Choose your dates for more accurate prices.

Is The ISO by Castle pet-friendly?

No, pets are not allowed at this property.

What time is check-in at The ISO by Castle?

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM.

What time is check-out at The ISO by Castle?

Check-out is at 11 AM. Late check-out is available for a fee (subject to availability).

Where is The ISO by Castle located?

Nestled on the beach, this Waipouli resort is within 1 mi (2 km) of Waipouli Beach, Fuji Beach, and Lae Nani Beach. Coconut Marketplace and Kapaa Shopping Center are also within 1 mi (2 km).

The ISO by Castle Reviews

Reviews

8.4

Very Good

Rating 10 - Excellent. 477 out of 1011 reviews
Rating 8 - Good. 346 out of 1011 reviews
Rating 6 - Okay. 117 out of 1011 reviews
Rating 4 - Poor. 42 out of 1011 reviews
Rating 2 - Terrible. 29 out of 1011 reviews

8.8/10

Cleanliness

8.4/10

Staff & service

8.0/10

Amenities

8.4/10

Property conditions & facilities

8.4/10

Eco-friendliness

Reviews

10/10 Excellent

Hayley

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Amazing place to stay in Kauai! 10/10 recommend. Friendly staff, prime location, beautiful grounds, clean rooms!
Stayed 3 nights in Jun 2025

10/10 Excellent

Brian

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The ISO is a great affordable option to some of the other overblown resorts in the area. Rooms are clean and comfortable, staff is helpful, and the hotel is conveniently located close to some great restaurants and island excursions. While it may not have the bells and whistles of nearby options, it has a pool, a great continental breakfast, and EVERY room is ocean-view.
Stayed 7 nights in Jun 2025

10/10 Excellent

Steve

Liked: Cleanliness, amenities, property conditions & facilities
Nothing to dislike like about the stay. Will recommend for friends for certain who want to visit Kauai. Experience was amazing, along with the staff.
Stayed 2 nights in Jul 2025

10/10 Excellent

DWARAKESH

Liked: Property conditions & facilities
Great views outside the balcony
Stayed 3 nights in Jun 2025

10/10 Excellent

Kyle

Liked: Cleanliness, staff & service, property conditions & facilities
Our stay was great! The ISO is in a great location within walking distance to several beaches and food options.
Stayed 2 nights in May 2025

10/10 Excellent

Celina

Liked: Cleanliness, staff & service, property conditions & facilities
Great location, friendly staff, good amenities
Stayed 4 nights in Apr 2025

10/10 Excellent

Natania Delfin

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Quiet, serene and conveniently located.
Stayed 3 nights in Apr 2025

6/10 Okay

Malcolm

Liked: Staff & service
The property is just old and the rooms are very small for two non married people even though they had two beds. They try hard to keep it clean but remodeling is necessary. All in all it was a good stay
Stayed 14 nights in Jun 2025

8/10 Good

Marcus

Liked: Cleanliness, staff & service
A little tired the property is, but with free bikes, a pool and great views to the beach- we were satisfied. Breakfast has some fresh fruit, sweet yogurt and bakery items. Staff were hit and miss (afternoon shift was lovely).
Stayed 3 nights in Jun 2025

8/10 Good

Alexandra

Liked: Cleanliness, staff & service, property conditions & facilities
Decent location, very clean rooms and property. Great walking path along the beach and hotels.
Stayed 7 nights in Mar 2025

8/10 Good

Maitland E

Liked: Cleanliness, amenities
Overall I enjoyed my stay. The views were gorgeous. Everything was clean. The pool was great and the beach access there was awesome. All the staff was lovely as well. There were just some maintenance that would really round out the entire experience.
Stayed 8 nights in May 2025

10/10 Excellent

Serine

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
We love the ISO! The proximity of the ocean, the quiet enjoyment of the phenomenal view, and the sunrise from the rooms are priceless. Great location, friendly stuff, and pleasant stay to enjoy this wonderful island!
Stayed 7 nights in Apr 2025

8/10 Good

Clint Eric

Liked: Amenities
The breakfast could use a few more selections and a coffee pot. The amenities were unique and nice! The bikes, morning yoga as well as the pool were nice to have! As well as the unique welcoming gifts. The cleanliness of the room was just okay. Noticed lots of dirt that was just missed as well as the room smelled of mildew.
Stayed 6 nights in Jun 2025

10/10 Excellent

Andreanna

Liked: Cleanliness, staff & service, property conditions & facilities
Great views. Great vibes
Stayed 1 night in Mar 2025

8/10 Good

Onell

Liked: Cleanliness, amenities, property conditions & facilities
It was ok. Shower didnr work wekl and couldn't get them to fix it. Continental breakfast was grab and go cold cereal, granola bars, yogurt etc. The pool waz nice
Stayed 5 nights in May 2025

8/10 Good

Laurie

Liked: Cleanliness, staff & service, room comfort
Hotel was nice but a little outdated room was clean liked the grab n go breakfast good location
Stayed 5 nights in Feb 2025

10/10 Excellent

Kevin

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Great place
Stayed 4 nights in Nov 2024

10/10 Excellent

Ellen

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
This was a delightful hotel with a lovely swimming pool and beautiful lawn on which we could relax and look at the ocean.
Stayed 3 nights in Jan 2025

10/10 Excellent

C Kim

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
We loved that if was so quiet and the ammenities were outstanding. The oceanside room was so relaxing and beautiful sunrise. Highly recommend. We will definatley stay here again. Kuddos to Roberta at the front desk for being helpful.
Stayed 2 nights in Mar 2025

10/10 Excellent

Anthony

Liked: Cleanliness, staff & service, property conditions & facilities
Beautiful setting. Grounds were pristine. Pool inviting. Great location. Quiet and only the sound of the waves. Beds were comfortable. Breakfast foods to go were well stocked. Coffee pot, and coffee in room very good.
Stayed 5 nights in Mar 2025

10/10 Excellent

Hugo

Liked: Staff & service, property conditions & facilities
Staff super friendly and the breakfast super convenient saves you aome bucks
Stayed 6 nights in Nov 2024

10/10 Excellent

Andrew

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Great location and property. AC was a little finicky but overall worth the stay for the price, and the view!
Stayed 3 nights in Dec 2024

10/10 Excellent

Laurie

Liked: Cleanliness, staff & service, amenities
Staff was so accommodating and helpful. Rooms need updating but property is located on the ocean with awesome views/waves. Shopping/restaurants nearby.
Stayed 2 nights in Jan 2025

10/10 Excellent

Lorna

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort

Great property.

We really enjoyed our stay at the ISO. The hotel met our needs for our 4 night stay. It is centrally situated so it was easy to explore. Clean rooms, comfortable bed and super friendly staff. Good dinner restaurant on property. Good selection of continental breakfast foods. Amazing sunrises! We would stay again if we come back to Kauai.
Beautiful sunrises
Stayed 4 nights in Feb 2025

10/10 Excellent

Bharath Tumkur

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Close to beach and they have a restaurant in the back!
Stayed 2 nights in Dec 2024