Leon---what a great idea---Margaret is gonna love a river cruise---you too!
Alice and I took the River Baroness (Google it) from Paris to Normandy and thouight it was better than any ocean cruise we have done (Although Tahiti is right up there!) Seems like it was 8-10 days or aboard and unlike the ocean cruises, ALL the tours are included---so the wine on board. Looking out the windows going along the Seine was like looking at a moving picture. The towns and places we toured were spectacular---like the very spot where Joan Of Arc was burned at the stake. Walking through towns that are the same today as the 1400s was amazing. Then the tour of Normandy was incredible. There are still German fortifications with big guns still in place. After we were there thet discovered a troop bunker that had been covered with dirt thrown up by bombs that was still loaded with food, ammo, guns, etc---no people though. I guess that one is open to the public now. After Normandy it was back to Paris where we stayed a few more days.
All those river cruises look great and seem to be a good bargain too.
We want to go again. Lucky you!