Just offshore is the tiny Roseninsel, where King Maximilian II built a summer villa. You can swim to its tree-fringed shores or sail across in a dinghy or on a Windsurfer (rentals are available at Possenhofen's boatyard and at many other rental points along the lake). There is a little ferry service (0171/722–2266 www.faehre-roseninsel.de) for €4. It runs daily between 11 and 6 from May to the end of September.
Possenhofen, Bavaria, Germany