The Bodensee (Lake Constance, in English) means fantastic cycling! Any wine-drinking fan of biking excursions in Europe should definitely cycle the Bodensee Radweg (Lake Constance Bike Trail) to experience the trail that German, Austrian and Swiss nationals have raved about for years, and to experience the great regional wines as well!
Following the shores of this lake, mostly on dedicated biking paths, the 260-kilometer-long Bodensee Radweg passes in and out of three countries: Germany, Austria and Switzerland, and through or along vineyards in Germany and Switzerland. (There is even one to see just outside Bregenz, in the Vorarlberg region of Austria.) It is a circuit, which means you can begin at any convenient spot along the trail.