My favorite meal (which I had twice!) was the grilled chicken sandwich at Whitewater snacks. Get the fruit option for your side and you'll get about 8-10 of the best strawberries. Yum! And, it's huge and cheap...hard to find anywhere at DL! On a non-health note, my husband opted for the fries as a side which I had to sample and they were sooo tasty and he got a huge portion of them with his sandwich if you have any fry fans with you.
The turkey sandwich at Riverbelle Terrace with the side of fruit salad was also pretty good for healthy park food. (note: MUCH better than the beef sandwich my husband got...his was dry and not so tasty)