Konstanz can easily be
reached by train from Zurich. The railway station is located
in the basement of the airport.
A return ticket Zurich-Airport/Konstanz
costs 45.00 SFR, a one way ticket 26.00 SFR.
From Stuttgart Airport you have to take the Underground (German: S-Bahn) to the main train station, Stuttgart Hauptbahnhof, and then the train to Konstanz. You usually have to change once, namely in Singen, and the journey takes about two and a half hours.
Going by train to Konstanz from Frankfurt takes about four hours. To reach the main station from the airport you have to take the S-Bahn. There is a direct train from Frankfurt Hauptbahnhof to Konstanz every two hours.
The journey from Munich to Konstanz takes at least four hours. You have to change at least once, usually twice or thrice.
From Friedrichshafen one needs
to travel by bus to Meersburg/Fähre (ferry), and then cross
the lake by ferry. At the Konstanz ferry station, you can reach Waldhaus Jakob by bus (no. 1, then change to no. 5).
From Zurich:
Take the motorway N7 to
Kreuzlingen/Konstanz, where you cross the border to Germany. You drive around the city center (left or right, both ways meet at the bridge). After crossing the bridge over the Rhine, follow the sign Mainau, then you turn off to the right following the signs Schmieder Kliniken and Friedrich-Naumann-Stiftung (yellow line on the town map).