Like Warren and Christo said, I think it depends a lot on what you want to do tomorrow and when you want to get to Cooper. I don’t know about their traffic at the moment, but a month ago when I was there they were full, and most of the BoatyBalls are still booked each day (all 15 were booked today). If you’re fine getting there around noon then you’ll probably be okay with a FCFS but if you want to arrive later you may want to look at getting a BB. With the off season approaching though it might not be as big of a deal.