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Magic Kingdom: At the end of Main Street, on the left if you are walking towards the castle, just past Casey's Corner
Epcot: In the middle of Future World, between Innoventions East and West, in front of the Fountain
MGM: At the intersection of Hollywood and Sunset Blvds, on the right if you are heading down Hollywood towards the Sorcerer's Hat
Animal Kingdom: Once you cross the bridge from the Oasis to Discovery Island, it will be on your right