We've only been there once. I thought it was pretty-much a big party town, at least during the evening/night. But in reading some of the previous posts, I didn't realize they had an acquarium, glass bottom boat tour, etc. But when we were there, it was just adults, no children with us.
I did like it. I thought it was a fun place to go. I'm not a big party person either. We did go on one of the snorkeling tours, and really enjoyed it. We spent some time each day sitting around the pool of the hotel, just relaxing. They don't have a whole lot of beach KW.