Magic Kingdom is my favorite, but Hollywood Studios is a close second. MK is going to be busier since Tron will be new and MK is usually busy in general. Epcot is cool too. And don't sleep on Animal Kingdom!
@Ticklish34 Big Thunder by far. For restaurants, it really depends. Be Our Guest is such a cool environment, but I'm not into the food. I like the Liberty Tree Tavern.