Since 12th of April BRANDNER Schiffahrt offers daily scheduled cruises until 25th of October 26 between Melk and Krems, with further stops in Emmersdorf, Spitz, Weißenkirchen and Dürnstein. Departure Krems 10:10h, departure Melk 08:25h and 13:50h. The detailed timetable is available here.