This is the latest craze, extreme waterskiing. Make sure you keep up your speed by hitting the suns. You will get extra time when you use the ramps to make a high jump. Mind that you don't hit the rocks or another speedboat, that will slow you down massively. You can accellerate by moving your mouse further from the waterskier and slow down by moving it closer to him. The mouse itself indicates the direction you're travelling in. Have fun!
Play this waterski game with the mouse.