Guidebook with maps/step-by-step
1/ From the "Parking de Beaumont" post, head for "Le Grand Piton (Tour Bastian) par La Thuile". You will pass the following signposts: "Despraz", "La Thuile (Chalet)", "La Thuile", "Sous Les Pitons", "Les Pitons", before reaching the "Grand Piton".
2/ Once you've reached the Grand Piton (Tour Bastian), follow the same path back down to "Sous les Pitons".
3/ From "Sous les Pitons" follow signs for "Beaumont (parking) (direct)". You will pass the following signposts: "Sur les Molliets" and "Chez Marmoux".