Parc du Doubs - The hermitage chapel in the rock face is reached through a late Renaissance style door and 200 steps. Next to it is the grotto in which St Ursicinus is supposed to have lived, and a viewpoint with a wonderful view of the Doubs.
This hike does full justice to its name. The trail leads from Les Brenets near La Chaux-de-Fonds to St. Ursanne, almost always alongside the River Doubs and crossing the Doubs Regional National Park from west to east.
Leave the wild nature behind you and slowly come back to the real world before reaching the medieval town of St-Ursanne. There, the Doubs makes a sharp turn; perhaps this is where it gets ist name from - dubitus meaning the hesitant in Latin.