I just got back last night from Mountain Paradise. I will post a review shortly. I just wanted to give an update on the food situation.
We avoided the restaurant based on the poor experiences posted here on Trip Advisor. We did eat at the pool bar twice. Once when we arrived (it was late) and then once again later in the evening after we had eaten a late lunch and wanted a snack.
Nachos: Not so good, cold beans, some sort of shredded beef, sour cream, packaged guacamole (or at least it tasted that way) and a weird rubbery melted cold cheese. In all fairness this is a Costa Rican hotel not a Mexican hotel but even so Nachos are hard to mess up. $10
Chicken Fingers: These were delish! Freshly battered with fresh hand cut fries. I believe we had about 8 generously sized tenders. They served them with some sort of "ranch" dressing. $8
I also saw someone with a club sandwich at one point. It looked pretty standard.
The breakfast buffet is by far the best. There are typical American options like pancakes, egg station, muffins/pastries toast as well as fresh cut fruit, rice & beans, plantains and some sort of chicken or beef. They also offered really good coffee, water and fresh juice. We enjoyed our complimentary breakfast each morning and there was so much variety we didn't get bored.
I would say take lunch and dinner outside of the hotel. SO many awesome local and inexpensive places to try.