usually everything I really wanted to bring in the first place. Definatly get a back pack for storing stuff in. And not one of those things with strings, one they hurt and two they leave awful sun tan lines. Especially when you're gonna go on fast rides and have no one to leave your things with, I just slip the straps in around each leg and it winds up with me in the end, even on rock n rollercoaster.
Hats, they come in handy so much, but so easily forgotten around here.
Pillows, no matter what hotel, having your own comfy pillow is worth it.
Mr Bear and Big Mickey... can't travel without the two. Big Mickey got left behind once and it was a sad sad trip without him.
20 gigs of memory for your camera. And then you'll still use more. Bring a couple memory sticks, just incase one freezes up or something, you'll have back up. Then when you get home, you can take it to a repair shop to see if they can still retrieve the images. Or else your only option is to reformat and loose everything on it.
Sign up for a photopass share or start one. They'll bombard you from the moment you walk in. And well sometimes the pictures turn out really good. And when you're only paying 15-20$ with a share, definatly worth the extra cost.
Mister or mini fan.... those things feel soo good. I have one myself and usually only remember to bring in a few times a year and yell at myself the rest of the time.
Get a tankini top or board shirt, especially if you want to go on kali river rapids, you will get soaked, and at least you can keep a dry shirt in the center compartment for when you walk into a.c. and the tanki will dry fast enough. Plenty of people walk around in bikini tops, but it's really not appropriate and looks awful.