This is a 'sporty' excursion featuring a DANGEROUS and FORBIDDEN section (2 alternative trails are suggested).Starting from St Jean d'Arvey village: climb to the prehistoric rock paintings, climb of the Feclaz chimney (prehistoric access to the high alpine pastures of La Feclaz), climb to the Peney summit 1356m, descent to the Doria pass, Doria waterfall, 'Grotte à Carret' cave & derelict house, Doria resurgence waterfall, return trail plus a tour inside the arboretum of ChaffardonA perfect fit condition is mandatory!