There was a time when being able to get a kosher airline meal at DisneyWorld was a treat, now however, kosher food stands are beginning to sprout within theme parks. In Pennsylvania, both Hershey Park and Dutch Wonderland host branches of Central PA's Kosher Mart. The stands feature both meat and parve selections and are a great break from smuggling sandwiches into parks. You may visit either stand without a park admission by requesting a pass from either park's guest services office.
In Canada, Canada's Wonderland near Toronto, has a kosher stand "Mess Haul Kosher Hot Dogs" near the Top Gun ride. If you have any information about any other theme parks with kosher food available please send me an e-mail and I will post it.