This is the perfect place for couples who want to just relax and enjoy nature. My boyfriend and I were really lucky that we were the only people staying there for 4 out of our 5 days, so we had the beach and pool completely to ourselves. The staff are sweet and extremely accommodating, and the beach is serene and beautiful, with clear, warm water. There are no phones or tv's, so you can ensure you're as cut off from the world as possible, although they do have free wi-fi. There are a lot of activities to do in and around Tambor, including zipline canopy tours, horseback riding, trips to the national park and Tortuga Island, and kayaking.
A few things I wish I had known before booking in Tambor:
-Fly into San Jose airport, NOT Liberia. San Jose has a direct flight to the small airstrip in Tambor that will save you hours in driving. Just check the schedule, as it is limited.
-Try not to go anywhere that involves driving for a prolonged distance on Route 160. This is one of the worst roads in all of Costa Rica. If you need to use it, try taking the ferry in Paquera instead, which goes to Puntarenas. It's only $24 and it saves about 2 hours if you're driving to Liberia or San Jose.
-When you rent a car, make sure it's a 4x4 with 4-wheel drive. Luckily Budget was good enough to make sure we did this instead of the original compact car I had requested. Even some of the paved roads are a bit bumpy, hilly, and winding.