A day in the Mili, the charming outdoor pool on wooden stilts, is wonderfully nostalgic. The oldest bathing facility on Lake Constance was built in 1825 and was originally used to train recruits. Today it's much more relaxed: Parents and children cool off in the lake or bask on the sun terrace, which is shielded from the shore. SUP is also available here, as well as a diving board, a table tennis table and a slackline across Lake Constance.