Incredible things are happening in the "riding a board on water" segment of the action sports populace. Of course the concept of a hydrofoil board really took off after the infamous sunscreen photo:

Zuckerberg is riding a very expensive electric-powered one that has a tiny propeller on the foil, but it's also possible to go windpowered like in the top photo. Stand-up paddleboarding (aka SUP) is very popular and hydrofoil boarding is the next level. I have heard it is unbelievably difficult to ride these for longer than a single second without having your board tip dive into the water & eating shit spectacularly.

It is interesting to see what tinkering people are getting up to now that lightweight and relatively cheap/energy-dense batteries + motors are readily available. Quadcopters and e-bikes are only the beginning. Peter Sripol is a pretty cool youtuber who builds lots of things in this genre, mostly model planes.