Your definitely need to get a GAC, W-Steele! It will make the trip so much more enjoyable and much easier on both of you. Just be sure to ask for what you need, such as a place to sit while waiting, alternate boarding arrangements, etc. I hope that both of you are going to have EVCs for your stay- they are really the only way to go if you have trouble getting from place to place. It will also be hot and humid in early Sept. so you might want to consider taking 2 of the Brita water bottles that filter the water for you (put them in your room's fridge over-night) since bottled water gets expensive, and also look for those insulated bottles that chill water and then mist it whereever you spray (every time I use mine folks seem to come from everywhere and beg to be "spritzed"
! Even my DD, who always wants to look her very best will take a bandana, hold it in cold water and then either wrap it around her head or around her throat to keep cool- she knows where every water fountain is in each park!!