We bring almost everything you all do, but dont forget diapers, tampons, etc. they are hugely expensvie onsite, as well as film, batteries, memory cards. i recommend bringing a netbook or laptop to view photopass photos of evening so you can retake the bad shots and make list of those you havent gotten yet.
more packing advice, cover head to toe with spf 60 in room before leaving (avon skin so soft repells bugs too) then touch up with sunblock stick which doesnt leak everywhere. this works unless you are hitting the waterparks.
pack your in park bag and tote it around the house the whole day. if you can't stand it, re-plan and re load. if folks did this before leaving home, they'd find out that fanny packs are a Godsend, if a fashion faux paux.
you also might try taking your own comfy pillowcases from home. when the trip is over, load them with your dirty laundry and you are good to go.
ziplocs will save your life. pint to 2 gallon size. toiletries, underwear, film, electronics, outfits, food, you name it.
run to the dollar tree or everythings a dollar store....pick up a bunch of things you can use for trip including: umbrella, rain ponchos 2 for buck, cheapie sunglasses, visor hats, gum, over the door holders..............
don't forget your chargers.
over the years we have forgotten at home: extra socks, extra shoes, swimwear, flip flops, dramamine, tylenol, toothpaste, conditioner, tampons. Guess what, they sell all of them in florida..............