We were happy with our choice to stay at the Flamingo Beach Resort & Spa. The rooms were comfortable and clean, but by no means soundproof--you hear your noisy neighbors. With that said, other things made up for this negative.
The hotel has a "family room/kids play area" with ping pong tables, pool tables and a movie theater. My boys spent a decent amount of time meeting and playing with other kids and/or watching a movie. We also liked the smaller/water volleyball pool off to the side of the hotel. We pretty well had that pool to ourselves for a few hours.
The big pool is nice. The beach just across from the hotel is beautiful and there is easy access.
There is a fabulous restaurant just a minute walk down the street from the hotel, and Tamarindo is just a 15 minute drive. We loved visiting Tamarindo (twice) but staying in the quieter, prettier Playa Flaming.
One final comment about the hotel -- the wifi connection was neither reliable nor strong. A number of guest had connection problems similar to ours. I don't know if this is a constant issue or just a temporary issue that happened while we were there.
I definitely feel comfortable recommending this hotel, and I would choose to stay here if/when I return to the area.