We did Beaches Jamaica in Negril about 4 yrs ago. My kids (then 6 and 9, now 10 and 13) still talk about it as one of their favorite vacations. We did have a lot of fun. The food on the buffet was ok, not great. We did the Japanese restraunt one night, and it was really good. Friday was a beach party, and it was great. I didn't care much for the children's program. It was mainly setting the kids in front of a movie or video game.
The pool was huge and gorgeous. The swim up bar, very nice.
If we could go again, I'd really like to go to the Beaches Turks and Caicos.