If you are a daring soul I would recommend finding a spot in the world showcase for dinner. We are very fond of the little take out stand by the Mexico pavilion, others are less impressed with it.
What we enjoy is to get there a little before the fire works and find a table that looks out at the lake and then sit back, eat, and watch the show.
DD2 loves the sushi in Japan, and we all love the crepes in France.
Then there is always Cosmic Rays for standard counter fare.