From the parking spot, walk on the road for 600 m towards the hamlet of Les Abrits, then take the path on the left and go downhill under the chestnut trees. 
1) At the abandoned mas (isolated farm), walk below the ruins and follow the path.
2) Cross the small stream and, before you arrive at the second stream, leave the path and take on the right a path that goes downhill towards the Gardon de St Martin river. Walk to the Gardon.
3) Do not cross the Gardon: the path follows the béal (irrigation channel) on the right. Careful: the rocks are slippery when wet!
4) At the end of the béal, walk to the gourgue (mill pond) and climb the path to the road. At the road, turn right and continue back to the parking spot.