Good luck, I went a couple weeks ago and sadly because I'm vegetarian, there are like 3 choices for me (not 3 restaurants, 3 actual meals!) in the entire park. It was crazy the day we went because there were so many people, they ended up closing the park to those entering in. The meal I had picked out for dinner (vegetarian gumbo) was sold out at 5pm!!
We ate dinner at a place in the New Orleans area that had sandwiches and salads and had a 'bar' where you could add various veggies to your sandwich.
You can't out-exercise poor eating habits.