From Marsanne, take the D57 towards the Marsanne forest. At the Col de la Grande Limite, park in the large car park on the left.
(S/E) Leave the car park via the wide path downhill opposite the road. Follow the signs for "Creux des Alexis". The path descends and climbs two drainage depressions, then curves clockwise in a very wide arc.
(1) At the "Creux des Alexis" hiking signpost, continue straight ahead. Shortly after crossing the high-voltage power line, look for a small path that forms a three-way junction on the left.
(2) Follow this small path until you reach the D57. Return to the car park by following it on the right, keeping away from it by passing through the open woodland (S/E).