You can purchase beach towels at the store there for about $15-25 each. Or you can rent smaller white towels for maybe $2 or $3 each. Or you can bring your own. We always drive and always stay in a one bedroom or larger, so we bring beach towels from home for the water parks.
Some people may have a problem with this, but I would just go to the pool at your resort and grab whatever towels you need. Just make sure you return them back to the towel drop at your hotel and not at the towel drop at blizzard beach.
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