I'm not a big fan, but DD4 has decided that she probably will want to get autographs on our trip. I'm going to have a 4 year old, a 2 year old and a double stroller by myself. Anyone have any creative autograph ideas that would be fairly easy for DD to handle by herself? My stepdaughter did a visor one trip but the Sharpie bled when it got caught in a drizzle so if we do something like that, is there a better 'pen' to use?