The starting point for this mountainbike tour is the village of Bonaduz, which forms a plateau with Rhäzüns. You can also enter the Rhine Gorge nature reserve from Bonaduz.

After making your way along the well-trodden forest trails across Bonaduz's idyllic forest landscape, you reach a little-travelled road offering spectacular views as it leads you to Sigl'Ault. You soon arrive to a narrow trail that descends smoothly to a road offering panoramic views over the Rhine Gorge. The «Ruinaulta», as the gorge is called in Romansh, is one of the most majestic and diverse landscapes in the Alps; it was created roughly 10,000 years ago as a result of a massive landslide. You follow it along, with a fabulously deep vertical view, past the «Zault» observation deck (photo stop recommended) before finally plunging back into the woods and going on leisurely forest trails back to Bonaduz.