Don’t Show Up In Costumes
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If you’re an adult, you will most likely be prohibited from donning a costume as the park goes to great lengths to keep with the theme and make it more realistic and representative of the fantasy world they’re trying to promote, so leave it to the kids. The park employees also serve as the “cast members” and hence, are expected to be in costume for these theme parks and your effort to express your patronage for certain characters might just cause confusion. This is not like Comic Con or cosplay where you can really go all out and become your favorite character.