Rainforest Cafe if you've never taken the kids to one of their locations. There is an indoor river raft ride with animated creatures adjacent to it kids would also like.
I don't know about fun, but the Golden Corral is where I take mine. They can never say there isn't anything they like. Go back as many times as they want. They love the dessert bar.
the rainforest cafe is fun for the kids and the food isn't terrible, but you can get MUCH better elsewhere. why not take them to a good restaurant, then just go do the fun things at rainforest cafe?