Lans-en-Vercors is located in the Vercors a beautiful massif of mountains. The Vercors massif and surrounding areas are protected as a regional park (Parc Naturel Régional du Vercors in French). Some especially wild and remote places of south eastern Vercors are in a more protected area named Réserve intégrale des hauts plateaux du Vercors (Vercors high plateaus reservation). These mountains were used as a natural fort by the French Resistance during the second world war.
Vercors is a perfect place for outdoor activities: Nordic Skiing (One of the largest Nordic skiing system of Europe), Alpine skiing with 7 ski resorts, Paragliding, Canyoning and Caving, base jumping, and of course aeromodelling with one of the most thrilling competition of the french cup with vertical cliffs.
More information on Wikitravel.
Here is the video. Enjoy !