There is a wicked campsite at Venosc, which is on the other side of the mountain. There is a cable car that takes bikes (no extra cost) right up to Les Deux Alpes and the red, wicked, long, flowy, bermy, steep route takes you from Les Deux Alpes straight back to the bottom of the same cable and about 1 min to campsite.
Weblink for site is Venosc Campsite
Stayed there last year, rode as many of the trails I could find and didn’t drive once. There’s even an XC route to Bourg D’Oisson along the river if you fancied it