We always recommend to purchase tickets and complete waivers in advance online, but both are available upon arrival. Note, during busy times of the year such as spring break and the holiday season, crowds are very large and if you didn't buy in advance you may have to wait outside until others leave.
There is no need to book anything ahead of time unless you want to have a party.
Just walk in
You can just walk in!
You just walk in :)
You can walk right in.
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