Yep lots of wave runners at 7 mile beach. Just take a taxi to 7 mile beach. You can rent chairs, have a drink at the beach bar and find lots of water toys to rent and play with. Beautiful white sandy beach.One of my favorites.
I did the Jet Ski's on 7 mile beach when I was there the only thing I remember was having fun and then taking a splash of water into my eyes. I'm a contact lense wearer and it was extremely painful. If you are in the same situation I would recommend grabbing a pair of the swimming goggles to wear while you ride.