From the highway Stuttgart/Singen (A 81) drive to the island Insel "Mainau" before you reach "Konstanz"

INSEL MAINAU:

Drive past the "Mainau" always on the main street


PLUS supermarket :

In Constance/Konstanz in the Mainaustreet turn off at the cross roads into the Hermann-von-Vicari-Street or just follow the camping signs.

SWITZERLAND:

Coming from Switzerland follow the signs "Meersburg Fähre".