13. You will walk - a LOT.
One of the things that you need to know about Disney World is that you will walk - a LOT. On our last trip, we averaged nine miles per day. Prior to your trip, get used to walking in your neighborhood, especially if you'll be pushing a stroller (those get heavy with all the souvenirs!) or if you aren't used to much physical activity. Get good shoes that are comfortable for walking and break them in prior to going - you don't want blisters to put a damper on the fun. If you have physical limitations, Disney does an excellent job providing accommodations, but you should research those accommodation options and be fully aware of how they will work prior to going.