Yes, you definitely need towels at Volcano Bay, but you have the choice between bringing your own or renting them at the park. Unlike many high-end hotel pools, Universal’s Volcano Bay does not provide free towels to general day guests. If you don't bring one from home (or from your hotel), you will have to pay a rental fee, which is typically around $6 per towel for the day. For guests staying at a Universal Orlando Resort hotel, it is often tempting to "borrow" a pool towel from the resort, but most hotels prefer you keep their towels on-site, so bringing a dedicated beach towel is usually the best bet. If you are a Premier-tier Annual Passholder, one of your perks may include free towel rentals at the water park. Since you'll likely be using lockers for your dry clothes, having a brightly colored towel of your own also makes it much easier to identify your "home base" of lounge chairs in the crowded sand areas around the Waturi Beach wave pool.