There's always something new. Well, new to me anyway. I first spotted this video over at Beach Pebbles.
It's called squirt boating, and uses a boat similar to a river kayak, but with a much smaller profile and volume. Plus the boat is mostly underwater -- in fact, some maneuvers, as in the video above involve the boat, and thus the paddler, being completely underwater. Cool stuff!
Here's a couple of more clips: