My wife and I will be flying into Frankfurt staying, 3 nights, 2 full days, intending to hire a vehicle, travel to the Rhine and Moselle Valleys, 2 nights, more than likely staying in Rudesheim, then to Koblenz, 3 nights and onto Cologne, 3 nights, drop off the vehicle, then go by train to Amsterdam. Alternatively we can do the round trip, ex Cologne, and drop the vehicle off in Franfurt, catch the train to Cologne then train it to Amsterdam. I would be interested to know what the Destination Experts and others think of the itinerary and number of respective nights. Would there be must do's working our way north rather than those mentioned above or forget north and go in any direction ultimately ending at Amsterdam ? A friend mentioned a boat trip, day / half day on the Rhine, said they were expensive however good, comments please. Look forward to your responses.