We're doing a similar thing for our trip in January. We bought a Cinderella doll at Sam's Club (it was with the Christmas gifts) and my husband thought that we should attempt to get a priority seating at the Castle (hoping for breakfast, but will take any) and we're going to make an invitation that says "Dear Kelsey, please come to my Castle on Jan xx at xx:xx am/pm", or something like that. I'll probably get more creative closer to Christmas. I would definitely do a little bag that has an autograph book, pen, disposable camera, disney snacks, perhaps a pin lanyard, etc.