After swimming back to shore, take off all your clothes, (except maybe your underwear if you feel a little uncomfortable) and start jogging in place as fast as you can. Next, look for any wood in the area, while running to move the entire time. Also, what are those skis made of? Besides that, perhaps cover yourself in the parachute while constantly moving, for now. Also, make a wall of snow parralel to the mountain, and crouch on the side which is away from the mountain. Once your clothes have dried off, put them back on, and keep on moving. Now, find a big pile of snow somewhere, and dig out a small cave with an entrance just big enough for you, to take cover in. Try to line the cave with your parachute, using the skis as vertical supports to keep the parachute against the ceiling. Now, try to get some sleep.