Cascade de Chaumie is a beautiful waterfall north of Colmars near Chaumie Haut. From Colmard drive north over road d908 to Chaumie Haut. From the chapel Saint Clair it is a 1 hour walk ascending 150 meter.
Although it is a firm walk, the waterfall Cascade de Chaumie looks really nice. I think you best can visit Cascade de Chaumie early in the summer (or late spring).