How do you rent the pavilions and how much if anyone knows?

I don't think you have to rent them. It's a park. Most parks you just set up and then clean up after you are done. Every time I have gone the pavilion area is empty benches. You can always call the number for the park that's listed on Google when you Google adventure park. The owner also seems to be active on the Q&A so reach out to them as well.

Hi @Cassie Roberts! You can reserve the pavilion here: https://livevibrant.com/pavilion-reservations