Don't forget:

Tickets!
Hats
Sandles/Flip flops
Extra pair of glasses/reading glasses (if needed)
Cologne/perfume
Sunscreen SPF30
List of emergency contacts
Dramamine (or other antiemetic)

I also bring:
Earplugs
Eyeshades
Moist Towelettes
Guidebooks
Extra memory cards for camera
Camcorder with plenty of tapes