From the old Gottardo Pass, go down towards Schwyz.
Turn towards Seestrasse, from where you can take the road leading to Zurich (the road is wonderful)
You can continue to Lucerne (we recommend a visit to the city, and to spend the night if you have time), or to the Lake of Constance (we recommend a stop or to stay overnight in Lindau, on the small island).
If you wish to extend the journey, we suggest the Füssen optional detour, visiting the Castle.