Get there early, early, early.
Drink lots of water and don't forget the sunscreen.
Then don't forget to reapply the sunscreen every few hours.
Most of the gift shops have Rx kits at the counter, so you can buy individual Dramamine, headache stuff and other things just ask at the check out counter. I know cat in the hat, Betty boop and FJ have them. WARNING the Dramamine at FJ was not chewable but I didn't notice till after I chewed it up. Talk about nasty and they do not have beverages there so make sure you read the packages.
Relax, & have fun