In november 2017, when fall is well established, we experienced the "Circuit des 25 bosses" with “Les Others”, an outdoor & travel media Just a few miles from Paris, it's a sporty hike in the middle of the rocks, pines and sand. This is an excellent training for mountain hikes and above all an exotic place! Running is not the main activity. We met a lot of people with crash pads on their backs: it's also a famous spot for climbing. We suggest you to discover the “Circuit des 25 bosses” at sunrise: a good opportunity to see wildlife.