At the starting line turn around, go back to before the bridge. Now get your speed up and cross the bridge, when you get to the other side DON'T touch the road, instead jump off the right side of the bridge (left in mirror mode) so that you land in the snow. Now go forward, WITHOUT touching the road, when you reach the start/finish line turn to the right and go out of bounds. Lakitu will tow you back to before the start/finish line, but you will still be on the other lap. You can do this 3 time and finish in 1/3 the time.