I'm not a vegan, but my daughter and I are both allergic to milk. We were able to eat all sorts of amazing things including ice cream all over the place. My daughter also had mac & cheese all over as well. They use Galaxy vegan slices and you can get Silk or Pacific Rice milks all over plus Tofutti or Rice Dream ice creams all over. Contact special diets. Info can be found in the stickies on the disABILITIES board.
When we stayed at Pop Century in February, the head chef was telling us that he had a vegan guest staying at the same time so he had ordered a special order of vegetables. He made me up an amazing stir fry with all sorts of things that he normally didn't have in stock. Definitely get in touch with special diets as they can help arrange for this sort of thing.