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When I took my little niece to Disney World, I took a Polaroid picture of each of us (separately) right before we left, then trimmed the pictures to fit into plastic luggage tags, to which I added a clip-on. I told her that if we get separated, to go to a security guard or other employee, and have them take her to the lost-children area. I then told her to show them my picture and not to release her to anyone else but me. I had her picture with me for easy identification. We could wear our ID at the waistband of our shorts under our shirts so they were not visible. She felt a little silly, but secure knowing I'd get her.