My children like the Sandcastle club.
It is not quite the "event" that the Neverland Club is, (they have been there also and REALLY like it) the Sandcastle Club was a nice place for them to "kid relax"
My 61/2 year old son really liked - eating kid food, not worring about "grown up" manners, choosing what he wanted to do, playing some computer games - sort of a down time(meaning quieter and less demanding compared to parks and other dining options)
He actually asked to go there quite a few nights just for an hour or two. He could have dinner and play some games while my husband and I ate.
My daughter, 5 years old also likes it there very much. She likes the arts and crafts and dramatic play area. While she didn't want to go quite as often as her brother, she didn't mind going when we had an adults night out.
Also, we were there in summer and never found it crowded.
Hope this helps!
Tammy