Freestyle kayak championships
Here in Augsburg we have a world class kayak course - built for the 72 Olympics and used constantly since then. When we're out bike riding we often stop by to watch the kayakers practicing on the white-water rapids course. On one particular weekend last spring it happened to be the German Freestyle championships and we got a spot next to the run and I shot away like a maniac.
Each competitor had 3 runs at the course, where they had two stops of 30 seconds each in two different types of turbulent water to show their stuff - flips, barrel rolls, etc. It was lots of fun to watch and I hope that I came up with a couple of decent shots for an non-sports photographer.