If you want to ski down the mountain, you'll need to reach the top of it first. Hop on Saint Pierre Ski Lift and enjoy the ride.
Need to know where to find Saint Pierre Ski Lift? It's in Lanslevillard, and an admission fee applies. If you have spare time, swing by Vanoise National Park, Mont-Cenis and Val Cenis le Haut Gondola as well. They're not far from the mountainside transportation system.