I love the ideas you have already posted! I never thought of the cookie sheet/magnet idea before(probably because my cookie sheets are stone!)
Great tips! I would also say, save room to bring home big bags of oranges and grapefruit from the Florida stands! I can't remember what exit it is but there's this great place on the way home we always stopped for citrus.
Also bring wipes, lots of wipes. Bring more than you think you need, you will thank me for this one, they certainly come in handy! And a few plastic supermarket bags for trash bags. That way you can keep it under control and throw things away as you go, and it won't look like a bomb went off in your car once you get to WDW. :lol: