If you want to ski down the mountain, you'll need to reach the top of it first. Jump on Combe de lOurs Chair Lift and enjoy the ride up.
To explore this mountainside transportation system, you'll need to find your way to Saint-Pierre-de-Chartreuse. There are plenty of other interesting attractions in this area, like Chartreuse Regional Nature Park, Grande Chartreuse Monastery, and Funiculaire de Saint-Hilaire-du-Touvet.