I just purchased 3 day Park to Park tickets for my family. I went ahead and printed the tickets at home since we are leaving next week and wanted them on time. I am a little confused as to how this is used inside the parks. I know we need a Park to Park ticket to ride Hogwarts Express. How would this work with a printed paper? Do I have to carry the paper around and show it before boarding the train? Also for the other days we enter the parks, is the paper needed as well? Or is the paper exchanged for something else? Thanks in advance.