Last year, we went to Ft. Wilderness for Mickey's Backyard BBQ, which was great. The characters were dressed in costume and we the kids had a blast. The unlimited beer, wine, and sangria doesn't hurt either! After that, we went trick or treating around the loops at the campground. The RV campers really go all out with decorations and everyone had a great time. If you don't want to do that, every resort will have some sort of special celebration. Usually a couple characters, a dance party, etc..