Yes, you can purchase when you arrive there. Make sure to check the local coupon booklets, there's usually a coupon for your tickets!
When you arrive is how we bought them both times, but as mentioned up above, grab a coupon book it saves you 3 dollars per ticket up to 6 people.
We went twice - first time bought online and picked up the ticket at the ticket office and then the second time bought directly there. Either way had to stand in line for the tickets - so no real time savings buying online. We stilled enjoyed the coaster and staff were friendly.
when you arrive works well
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