We use beach towels as blankets on the way down. THe kids love this, and then it's something they can use at the water parks when we arrive.
We bring lots of ziploc baggies -- so very handy for so many things!
Also pack film containers with 2 quarters, then a penny, 2 quarters, then a penny, etc etc. When you come to a pressed penny machine, your child will have the correct change ready to go.
We bring an over-the-door shoe hanger bought solely for travelin' purposes. It's even Disney-decorated (it's an all-canvas type that holds 20 shoes -- 4 pairs in 5 rows. I think I got it at Lowe's for about 10 bucks and then painted on it). Each of our 5 family members gets a "row" in which to stash stuff -- like their sunglasses, personal items, autograph books, ziploc baggies with toothbrushes and paste, etc. Keeps the bathroom counter relatively free and clean too!
We bring the Orlando maps too -- even though we drive and know the route, one year we got completely turned around because road construction and an accident sent us on a detour. We were clueless -- we finally spotted a motor home from Quebec that had a Disney bumper sticker. I told DH "FOLLOW THAT WINNEBAGO!" Sure enough, Winnebago was headed to Fort Wilderness, which led us to WL.
We bring misting fans and sunscreen.
I always bring a box of goodies for the kids and paper bags with handles and stickers. They decorate their "bag" with the stickers. THen every night they put the bag out. In the a.m. there is a small treat in it.
And lest I forget -- the green stuff. <a href='http://www.smileycentral.com/?partner=ZSzeb008' target='_blank'><img src='http://smileys.smileycentral.com/cat/12/12_1_102.gif' alt='Dollar Smiley' border=0></a><a href='http://www.smileycentral.com/?partner=ZSzeb008' target='_blank'><img src='http://smileys.smileycentral.com/cat/12/12_1_102.gif' alt='Dollar Smiley' border=0></a><a href='http://www.smileycentral.com/?partner=ZSzeb008' target='_blank'><img src='http://smileys.smileycentral.com/cat/12/12_1_102.gif' alt='Dollar Smiley' border=0></a><a href='http://www.smileycentral.com/?partner=ZSzeb008' target='_blank'><img src='http://smileys.smileycentral.com/cat/12/12_1_102.gif' alt='Dollar Smiley' border=0></a><a href='http://www.smileycentral.com/?partner=ZSzeb008' target='_blank'><img src='http://smileys.smileycentral.com/cat/12/12_1_102.gif' alt='Dollar Smiley' border=0></a> LOTS of it!