Depends what course you do. It's pricey but well worth it.
Check Groupon. We paid about $80 for 2
You can just show up but there might not a open slot for the next zip trip out so you might have to wait it is better to book it ahead of time staff three different courses of zipping if it's for beginner the tree toppers a good start but for adults and you want to spend the money go for the 9 step lines rope Bridge course I forget the name but it's awesome
I would book it. They run tours on a schedule and this is high season for them. You should check their website. But I highly recommend this experience. SO.MUCH.FUN
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