Park in the last car park before the castle, on a right-hand bend in the access road.
(S/E) Head in the opposite direction to the castle and immediately take a dirt road on the left.
(1) At the first left-hand bend, leave the road and take a forest track on the right.
(2) At a small pass (elevation 713), ignore a track on the right and turn left. Ignore a track descending to the right and continue around the Serre des Aiguilles on the right. You will come to a dirt road at a large plateau (elevation 773).
(3) Take a steep path on the left indicated by a wooden sign. Follow it to the Serre des Aiguilles viewpoint.
(4) Retrace your steps back to the road.
(3) Take the road on the left and return to the first fork you passed on the way out.
(1) Continue on the same track to the right, following the same route as on the way up, to return to the car park (S/E).