Just about anything. We brought fishing poles towels drinks food. they didn't tell us that we couldn't bring anything we brought whatever we wanted.
Towels, shades, water bottles cameras; pretty sure coolers are a no-no... But their snacks & adult drinks are the cheapest you'll find on any tourist attraction.
You can bring whatever you want. They don't care. But their drinks and snacks are very reasonable
They have drinks for $1. I don't think they would say anything if you bring a water bottle or soft drink. It's a great tour. Worth every penny.
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