If you want to ski down the mountainside, you'll need to make your way to the top of it first. Jump on Roc dAude Ski Lift and enjoy the ride.
This mountainside transportation system is located in Les Angles. Once you've explored everything you want to at Roc d'Aude Ski Lift, have a look at nearby Les Bains de Llo, Lac des Bouillouses, and Lac de Matemale.