I wouldn't stress too much. There's lots of healthy options there. Okay, well maybe some are not so healthy, but at least they're either low in fat or high in protein.
You'll have no problems finding fresh fruit, fruit bowls, and yogurt around the parks. It seems to be everywhere.
Many restaurants/eateries also have fresh salads on the menu (some with grilled chicken). Just watch out for the amount of dressing you use.
And of course, the Bengal BBQ can be a decent place to go grab a skewer made of meat & veggies. (These are delicious.)
There's several places to get soup in a bread bowl. Don't eat the bread bowl of course, and try to stay away from the creamy soups, but the chilli and the gumbo are pretty good.
A turkey leg isn't too bad either, but they're HUGE, and can be split between four people!!!
I've come to follow this rule when on a diet at DL (or anywhere): "If it isn't potatoes, bread, or pasta, then eat it!" (I know that sugar is bad too, but when I'm on vacation, I do like to treat myself to cotton candy, or chocolate, a slushy, or something lighter like that, you know what I mean?)
