We always go to DTD on our first day. We eat at the Rain Forest Cafe. My kids just love this place. I have heard lots of people on the DIS rave about the Earl of Sandwich in DTD. I have not eaten there but I know it is suppose to be very reasonably priced. Here is some of the other restaurants in DTD.
Cap'n Jack's Restaurant
Fulton's Crab House
Ghirardelli Soda Fountain and Chocolate Shop
McDonald's
I'm sure there are more. That's all that comes to mind.