On the EuroVelo 6 along the Doubs and Rhine-Rhône Canal to Baume-les-Dames.
Beautiful landscape, great bike path, nice places to take a break.
More information: de.eurovelo.com/ev6/france
High grotto with wonderful limescale deposits - accessible via a metal ladder even without equipment. The grotto does not lead deep into the rock, the daylight is sufficient, you do not need a flashlight. It is freely accessible to everyone.