I had one, it is the 3rd best thing you can do with your pants on... after flying aircraft and competing in MC days.

I had a 99 Kawasaki 1100cc 2 seater in This awesome yellow colour. I sold it to some dude who paid WAYYY too much for it. Was awesome being able to blast around the place. The Cops would always nab me through the canals. Even if I was trying to do 5knots. Everybody who does not own a jetski hates you, because they are either:
Too noisey
Too smokey (2 stroke only)
Too fast or;
Jealous.

Get one, GET ONE NOW!! I am in the market for one. After a Road bike, a new plane and a couple of other things I have no money for.