re: Staying Cool in Disney World in July

If you have some way to stow it like a stroller, a small ice chest with florida water in it, with small neck towels to soak it up.

A good hat.

Bring a change of socks for each person if you will be in the park all day, and change your socks in the late afternoon.

Dri-fit shirts and shorts

Sunscreen

Don't be afraid to take a break mid-day. Go back to your room, go to a resort restaurant, etc.