Flowrider on Adventure of the Seas. Reservations?

[wtang]

Thanks to everyone who answered my question about reservations for the ice skating show.  The answer: no reservations, first come first served.  Now I have a question about Flowrider if y'all don't mind.  If my kids are not purchasing a lesson, do I make reservations for them to try Flowrider during the open times?  Or is Flowrider first come first served?  Thanks for any tips and help. 

[Clarea]

First come, first served.