Things I'd recommend

• Cargo pants. Extra pockets are huge, esp. since there's a thing about not putting anything in back pockets.
• A pair of flip-flops in your size. You'll want this for your bathroom, the complimentary ones are about 8's in men's sizes.
• Maybe a big towel. I haven't really seen any yet.
• Other than that, there's really not much. I thought this list would grow, but most things you need are already here...and not always particularly expensive.