You park your car at Pont de Nant (Switzerland)and take the pedagogical way. You have a botanical garden. This first part is quite easy
After 30 to 45 mn you turn right and go up. You can see nice views. You climbe from 1350m to 1650m. You can have dangerous or difficult part but you have chain you can hold. The trou à l’ours is a kind of cave that you have to cross. It is not wide. A real adventure.
Nice walk with medim difficulty. But good equipment is recommended with good shooes. At the end you join the parking after 3 hours of walk.