Two additional comments to add to my review above:  1.  The Viking Rinda can never dock in Paris because it is a longship and it is too long to turn around on the Seine River.  The ship makes a very wide sweeping turn in a very wide part of the river to sail back to Le Pecq.  The Seine simply isn't wide enough near Paris to make this turn.  2.  At the beginning of our cruise, our cruise director told us that we were not going to see Paris at night as it was not part of our itinerary.  Only after many passengers asked to see the City of Lights at night was the tour added to our trip.