I also agree with Rainforest Cafe. We love it!
Planet Hollywood is neat, but I think the kindergarten child will enjoy Rainforest Cafe more. Plus, in my opinion (as well as DH's), Rainforest Cafe's food is much better!!!
There is always McDonald's too. We hate the idea of eating there while on a Disney vacation!!! However, if you have a picky eater, normally all kids love McDonald's.