Park in the hamlet of Longuiers.
(S/E) Take the farm track south-eastwards, towards the woods, and you will soon reach a crossroads of paths.
(1) Stay on the path on the left to reach the Aven du Puech Nègre.
(2) Continue straight along the track (south-east). It continues as a gently descending path leading to the promontory.
(3) Retrace your steps along the route you took on the way out to return to the car park in the hamlet of Longuiers (S/E).