Jump in your innertube and ride down the lake, avoid obstacles and fly off ramps to jump over piles
Score as many points as you can.
Ski down the hill and try to stay on the ski trail while dodging obstacles.
Dodge the balls and throw them back to knock the hell out of your opponent.
Surf the chilling waves but don't slip up or you'll fall off
Move your team so they don't get hit by the enemy balls, then throw your own at them.