Various ferry companies, including Switzerland’s SBS Schifffart, Austria’s Vorarlberg Lines (www.bodenseeschifffahrt.at) and Germany’s BSB (www.bsb-online.com), travel across, along and around the lake from mid-April to late October, with the more frequent services starting in late May. A Swiss Pass is valid only on the Swiss side of the lake.
Trains tend to be the easiest way to get around on the Swiss side, as buses are on the German bank. The B31 road hugs the north shore but can get busy. On the south shore, the N13 shadows the train line around the lake.