The classic: around Lake Constance (section between Bregenz and Friedrichshafen)

The Lake Constance cycle route takes cyclists from Bregenz, the northern shore of Lake Constance, to Friedrichshafen.

The cycle route heads from the port of Bregenz along the lake shore to Lochau. Cyclists should follow the markings from there to Lindau, Bad-Schachen through Wasserburg to Nonnenhorn and on to Langenargen through Eriskirchen to Friedrichshafen.

https://www.vorarlberg.travel/en/safety-tips-on-the-mountain/