Hydrofoil kiteboarding is a completely new way to ride the wind.  It's the closest thing to a hoverboard you can get.  It's silent, smooth, fast, and you can go upwind greater than a race board and with no strain on your legs.  

Relative to other water sports, like buying a boat, a jetski, or even putting fuel in those things for a season, hydrofoils are less expensive.

There is a learning curve and they only work in deep enough water that is weed and debris free.  However, once you get it, you will be so glad you did.