My wife and I rented a jet ski last weekend at this place and had a great time! We didn't make a reservation and just walked up, booked and went - all in a matter of 15 min.
The prices are a little steep - $200 for two hours. However, it's very convenient and the team sets everything up for you, jet ski is in the water (no need to haul the jet ski). The convenience was worth it for me.
We will be renting again in the near future.