Follow the signs to Thusis, then pick the exit on your left.
Keep the direction for Tiefenlasser, then for the Abula Pass (we recommend to have a thermal bath in the small pool on the road, since you can even hire the swimming suit).
Descent to Davos (Engadina Valley), a beautiful valley leading to St. Moritz; then you can make your way back from the Maloja Pass to the Valtellina valley.
From here it is possible to fit into the tour C 2 or the S. Bernardino.