Think of the standard athletic position. Awaiting a serve in tennis, ready to play defense in basketball, a shortstop waiting for the pitch... These are all examples of how you should be standing on the skis once you're up. And be sure to keep your eyes up by the horizon. I find it helps to have an attractive woman in the boat to look at.
I spent most of my money on booze, broads and boats. The rest I wasted. - Elmore Leonard