If you have free dining I say Teppan Edo. It's like a Bennihana's where they cook the food in front of you on the hot plate. They really make a show of it and the kids have a blast!
Coral Reef is ok, if you don't sit near the windows it's not as much fun, Garden grill is also ok, it does have characters, but it is a spinning restaurant and some people get motion sick (my sister did).
We also like Beirgarten, which is buffet style and usually has the mac and cheese and pizza that other buffets have in case you have picky eaters.