The lake boats are the easiest way to see why Tegernsee became such a beloved resort. Services call at several landing stages around the lake, including Tegernsee town, Gmund, Bad Wiessee, Rottach-Egern, Abwinkel, and St Quirin, so you can make a simple circuit or use the boat to start a walk on the opposite shore.
On a clear day, sit outside and watch the shoreline change from monastery buildings and villas to reed beds, meadows, and mountain slopes. Timetables vary by season, and fog or storms can interrupt service, so check the day's schedule before building a plan around the boat.