The grounds were lovely, the people were very pleasant and helpful and the food was very good. However, this place is about an hour away from La Fortuna, which was a $60 cab ride each way. (Our travel agent misled us about this fact.) The springs are nice, but they're about a mile away. The staff will happily drive you to the entrance (about 800 km) after which you hike about 200 km? down to the springs. There is also a spa down by the springs where we each had a great and inexpensive massage. There's also a bar down there where you can get drinks and some food. I didn't have anything but my friend said the mojito was great.
We stayed in a bungalow, which was a very nice size. More than enough room. However, the mildew smell was a little overwhelming, the beds were not the most comfortable and there was no hot water.
We actually left a day earlier than planned because we felt like we were so secluded with nothing much to do in the area. We had the staff arrange our transportation to Tamarindo, which was our next spot, and that's when we met Frank. If you go to Termales de Bosque and want to find something else to do, have the staff call Frank of Frank Tours! He is awesome! He was our ride to Tamarindo (which is about a 5 hour trip), but he went out of his way to stop and show us things along the way. He is a delightful man who really enjoys what he does. We loved him! We just wish we would have known about him earlier!