This was our first trip to Costa Rica, and we couldn’t have picked a better place for the type of vacation we wanted. My wife and I stayed at Rio Perdido in East Bungallow 18 for 7 days. During our stay, we did a lot of hiking, both on site and at near by national parks. If you want to enjoy your hike in nature, I strongly recommend bringing hiking shoes, water bottle or hydration pack and DEET 30 mosquito repellent. We also brought headlamps, which we were glad we did as they keep lighting to a minimum. Obviously, the thermal river is a must do. On-site, we also did the Zipline (amazing!) and got messages at the SPA.
The food was very good, but we were glad we rented a car to explore off-site local food. Off-site we also did a day of white water rafting, which I strongly recommend.
The only warning I can give is that the hotel is secluded, which is what attracted us, but getting to and out of the hotel is not convenient.