Hello there. We have bought our Universal 7-day tickets from our local AMA office (AAA, CAA). They told us that we would have to show picture ID each day we use the tickets and that this would apply to our children as well. Since my children are too young to have any picture ID such as a drivers license, etc. are there any ideas as to what to do if we don't want to carry their passports with us? (We'd prefer to keep those in the safe where we are staying). Thanks!