“Drei Mann in einem Boot“ (subtitled Vom Hunde ganz zu schweigen) is a 1961 film comedy by Helmut Weiss starring Walter Giller, Heinz Erhardt and Hans-Joachim Kulenkampff.
The film was shot on Lake Constance (including at the “Hotel Bad Schachen” and the adjacent “Lindenhofpark” to the west in Bad Schachen, a district of Lindau, as well as in Meersburg and Wasserburg), and also along the entire Rhine as far as Amsterdam.