Route Etappe 4Konstanz- Mersburg  

This route follows the Bodenseeradweg and is (mostly) well marked. Be sure to turn right (east) in Espasingen. The descent into Bodman-Ludwigshafen is steep, with a pitch marked as 8%, and no bike lane. The stretch from outside Ueberlingen to Meersburg will be extremely congested on sunny weekend afternoons and not everyone using the path is paying attention! I estimate that around 2km of this route is not paved, but hard-packed dirt road. The ferry at Meersburg cost me 4,80 euros.