If you’re at one of the Disney water parks, it’s a good idea to wear some sort of shoes. The ground can get hot, even where it’s wet! Also, unless you walk barefoot a lot, your feet aren’t used to walking on that much pavement. Walking barefoot for short distances is okay, but walking too much without your feet protected is something that you’ll pay for later. There are places to keep shoes at the bottom of the slides so they won’t be a bother.