I've been going there since I was a kid, but last summer was the first time I cared about getting gluten-free food. On their website they list places in the park for people with special diets, including gluten-free. My favorite was the stands that just make french fries in dedicated fryers - it was wonderful. And the rides are awesome, too! There are two parts to the park - Dorney Park is the amusement park, which has some killer roller coasters, and Wildwater Kingdom is the water park side - all the gluten-free stuff seems to be on the Dorney side, so eat there before you go to the water park. Worth a trip if you're in the area this summer.

Dorney update: two years later, they now say on their website that the fries that were previously listed as gluten-free are fried in oil with non-gluten-free items. Sucks.