We wish to travel from Cologne to Baden-Baden, and plan to use a train/boat combination to do so. Train from Cologne to Koblenz. We need to know if the boats have place to stow luggage? And what about if we wish to disembark to tour Marksburg Castle? What about the bags then? Has anyone done this? We don't wish to travel the Rhein both directions. We would like to make a stop in Bacharach, and then go on to Baden-Baden.