I've been beyond blessed to travel to several foreign cities/countries, including much of Europe, the middle- and far-east, Mexico, central America, and I can state unequivocally that Nayara has the best customer service in the world. I was blown away with so many things--too many to count--but I'll name a few: The outdoor showers. Who knew it would be so awesome to shower outside in the rainforest each morning. The housekeeping staff comes not once, but twice per day. The hotel grounds are enormous, so you can order a golf cart and driver at no charge, beyond what you might tip. The whole place is surrounded by jungle and full of great jungle "music" at night, from the monkeys to countless birds species.
After 4 nights there, we drove to Manuel Antonio and rented lodging just buried in the jungle, and again, you can request a driver to take down through the rain forest to get to a private beach. (I was alone, sitting in a beach chair and reading a book--I needed a day of relaxation before the remainder of our trip--I looked down and saw something tiny crawling across, and when my eyes adjusted, it was about a million teeny crabs moving toward the ocean.) This hotel is called Los Altos, and it was the first time for me that an elevator opened right in my room.
Besides the national park, you'll need no help to find plenty of places to see/things to do.
If you're eating in one the many outdoor restaurants, you'll want to be wary of the capuchins. They'll steal food right off your plate.