Grassy Key, FL

Travel Guide

A dolphin swimming near a wooden dock and a tree branch in the water.
A beach with clear turquoise water, surrounded by lush green trees and a distant shoreline with buildings.
A calm bay with clear turquoise water, surrounded by lush green vegetation and a sandy beach.
A building with a blue awning labeled "Dolphin Research Center" and a dolphin logo.
A dolphin sculpture and a sign for the Dolphin Research Center.
Rainbow Bend Resort

Rainbow Bend Resort

2.5 out of 5
57784 Overseas Hwy Marathon FL
$149 nightly
The price is $168 total per night from Nov 4 to Nov 5
$168 total
Nov 4 - Nov 5
Total with taxes and fees
Book a stay at this beach hotel in Marathon. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff in our ...
8.2/10 Very Good! (1,001 reviews)
"We've stayed here a few times and always enjoy ourselves. Peaceful quiet little resort to bring our pup and enjoy a few nights away from the stress of working and living in South Florida. Perfect place for us to get some R&R without travelling too far. Can't wait to come back!"

Reviewed on Nov 2, 2026

Rainbow Bend Resort
Gulf View Waterfront Resort

Gulf View Waterfront Resort

2.5 out of 5
58743 OVERSEAS HWY Marathon FL
$137 nightly
The price is $154 total per night from Dec 1 to Dec 2
$154 total
Dec 1 - Dec 2
Total with taxes and fees
Stay at this hotel in Marathon. Enjoy free WiFi, free parking, and daily housekeeping. Our guests praise the helpful staff and the clean rooms in our reviews. ...
Gulf View Waterfront Resort
Grassy Flats Resort & Beach Club

Grassy Flats Resort & Beach Club

4 out of 5
58182 Overseas Hwy Marathon FL
$233 nightly
The price is $262 total per night from Nov 16 to Nov 17
$262 total
Nov 16 - Nov 17
Total with taxes and fees
Stay at this hotel in Marathon. Enjoy free WiFi, free parking, and 2 outdoor pools. Our guests praise the helpful staff and the property condition in our reviews. ...
9.4/10 Exceptional! (502 reviews)
"Overall, I had a very pleasant stay, and everything was great. However, I was a little disappointed with the late check-out policy. I noticed that many rooms appeared to be unoccupied, so I asked if I could stay just one extra hour. Unfortunately, I was told that it wasn’t possible. I found this ..."

Reviewed on Nov 1, 2026

Grassy Flats Resort & Beach Club
See all 2,338 properties in Grassy Key
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
Wide Horizon oceanfront. 4 bedroom, 4 ½ bath, kayaks, pool + observation deck.

Wide Horizon oceanfront. 4 bedroom, 4 ½ bath, kayaks, pool + observation deck.

Marathon FL
Book a stay at this beach vacation home in Marathon. Enjoy free WiFi, private pools, and a beach locale. Popular attractions Crawl Key and Grassy Key Marina ...
10/10 Exceptional! (49 reviews)
"Awesome views. Clean house. Fun places within walking and biking distance. Had a great time with the family playing the provided games and hanging out by the pool."

Reviewed on Oct 19, 2026

Wide Horizon oceanfront. 4 bedroom, 4 ½ bath, kayaks, pool + observation deck.
Brand New Three-Story Home's in Gated Community with Beach & Pool

Brand New Three-Story Home's in Gated Community with Beach & Pool

Marathon FL
Book a stay at this beach vacation home in Marathon. Enjoy free WiFi, a beach locale, and a water park. Popular attractions Keys Cable Park and Grassy Key Marina ...
10/10 Exceptional! (1 review)
"Beautiful property and very responsive host."

Reviewed on Jul 5, 2026

Brand New Three-Story Home's in Gated Community with Beach & Pool
Yacht Haven Marina

Yacht Haven Marina

3.5 out of 5
5 Sombrero Blvd Marathon FL
Stay at this houseboat in Marathon. Enjoy free WiFi, free parking, and a picnic area. Our guests praise the helpful staff in our reviews. Popular attractions ...
9.6/10 Exceptional! (380 reviews)
"Very clean and comfortable beds. Great position in marathon. Effective a/c. Highly recommended"

Reviewed on Nov 1, 2026

Yacht Haven Marina
See all properties in Grassy Key
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.

Things to do

Marathon: Rhum Runner Aqua Park Adventure

Marathon: Rhum Runner Aqua Park Adventure

$38
per adult
Marathon: Rhum Runner Aqua Park Adventure
Sunset Cruise

Sunset Cruise

$89
per adult
100% of travellers recommend
Sunset Cruise
Day Sailing Adventure in the Florida Marine Sanctuary

Day Sailing Adventure in the Florida Marine Sanctuary

$120
per adult
100% of travellers recommend
Day Sailing Adventure in the Florida Marine Sanctuary
Marathon: Cruisin' Tikis Marathon - Private Sunset Cruise

Marathon: Cruisin' Tikis Marathon - Sunset Cruise

$110
per adult
Marathon: Cruisin' Tikis Marathon - Sunset Cruise
Marathon Key FL: Snorkel Trips and Sunset Cruises

Marathon: Snorkeling and Sunset Cruises

$70
per adult
Marathon: Snorkeling and Sunset Cruises
Marathon FL Sandbar Cruise & Sightseeing Adventure

Marathon FL Sandbar Cruise & Sightseeing Adventure

$114
per adult
100% of travellers recommend
Marathon FL Sandbar Cruise & Sightseeing Adventure
See all activities in Grassy Key

Frequently asked questions

What is a good itinerary length for Grassy Key?
A good itinerary length for Grassy Key is two to three days to enjoy Keys Cable Park and take a Marathon Sandbar Cruise & Sightseeing Adventure. An extended stay of four to five days lets travelers explore more of the Florida Keys, perhaps with a Florida Key West Self-Guided Driving Tour. See Grassy Key Activities.
What are the top things to do in and around Grassy Key?
Grassy Key offers water activities and scenic tours for a relaxing getaway:

  • Visit Keys Cable Park for watersports.
  • Take a self-guided driving tour across the iconic 7 Mile Bridge.
  • Embark on a sandbar cruise and sightseeing adventure from Marathon.
  • Enjoy a tranquil sunset cruise.

Can I book a refundable hotel in Grassy Key?
Yes, Expedia offers many flexible booking options, and you can look for refundable hotels in Grassy Key by entering your dates and using the refundable or fully refundable filter. Always check the hotel's cancellation policy before you book, since terms can vary by hotel, and visit Expedia help center for further details.
Why book a trip to Grassy Key with Expedia?
Expedia makes it easier to plan your Grassy Key trip with travel tools, flexible search options, and bookable trip components all in one place. You can organize your plans in one account and use Expedia to help build a trip that fits your budget and travel style. Find out more about how by visiting Expedia's Trip Planner page.
Should I stay in a hotel or vacation rental in Grassy Key?
The best choice depends on your travel style. Hotels in Grassy Key can be a good fit for convenience, on-site amenities, and shorter stays, while vacation rentals may offer more space, privacy, and home-style amenities for longer trips, families, or groups. With Expedia, you can compare both options side by side, read traveler reviews, and filter by amenities to find the right fit for your trip.
How can I manage my Grassy Key trip on Expedia?
Once you've booked your Grassy Key trip, you can manage it through your Expedia account or the Expedia app. You can view your itinerary, access booking details, make eligible changes, and check for updates in My Trips. The Expedia app can also help you stay organized while you travel.
What if I need help during my Grassy Key trip?
Expedia offers customer support before, during, and after your Grassy Key trip. If your plans change or something unexpected happens, you can review your booking in My Trips and use Expedia help center channels for help with eligible changes, cancellations, or travel issues.
How can Expedia help me plan my first trip to Grassy Key?
If it's your first trip to Grassy Key, Expedia can help you plan by bringing together stays, flights, activities, traveler reviews, and trip-planning tools in one place. With Expedia's Trip Planner you can compare options, read reviews from other travelers, and build an itinerary that matches your interests and budget.
How can I save on my Grassy Key hotel booking with Expedia?
Join One Key™ for free to unlock instant discounts with Member Prices on select hotels. You can also earn and use OneKeyCash™* on eligible bookings on Expedia. Booking in advance is usually another great way to save on your Grassy Key hotel.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

Cities near Grassy Key

A beach with clear water, palm trees, and people relaxing on the sand.

Marathon

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