Wow, I wish I had read this thread sooner. I just finished the Fall Advantage program, June through January. I was lucky enough to work in Fantasyland Attractions (although "lucky" was stretching it, at times).
My advice: during the interview, only check what you want to do. If you absolutely do not want to work in food service, don't check it. It will seem like Disney is Not Picky about its interns. You will meet quite a lot of bozos during your program.
Don't be discouraged by this, though. You are also going to have a Lot of Fun. I promise you that. If you want to stay with the company, this internship will help a lot.
Don't plan on saving money. Do figure out a way to work the attendance system. You're going to spend a lot of time at the parks, but try and get out of Orlando every now and then; Clearwater and Daytona are beautiful. Universal will be a splurge, but it will be nice to purge the "magic" every now and then.
Good luck to you, and Have Fun!