An ascent through pine woods, a descent through an oak wood and a short, hidden stretch to reach Puy Aillaud.

When you come to the the Vallouise bridge ("Pont de Vallouise"), take the track leading up the left-hand bank of the Gyr leading towards Pelvoux.  

Cross the Gyr over a wide footbridge and after a short distance, on a hairpin in the track, take a path running below a stable and soon after this take the path on the right to Puy Aillaud. 
After the Pas d'Aval, a short narrow stretch through boulders, follow the yellow or white painted posts until you reach the road. Turn left onto the road to pass below the village of Puy Aillaud and the take the track towards the chapel of Saint-Jean. 
Turn left back onto the road for a hundred metres or so, leaving the walking trail that leads away straight ahead.
After the hairpin, you plunge onto a steep path edged with deciduous trees running straight down the slope. The path runs through a forest of oak and pine trees, and you continue the descent until you reach Vallouise. The descent can be slippery in places.