From the sophisticated City of Light to the bucolic Normandy countryside, this route follows the Seine north toward the English Channel. Beyond the glories of Paris, you'll take in Monet's Giverny, Joan of Arc's Rouen, and somber D-Day sights. Most cruises begin and end in Paris (only CroisiEurope offers one-way options), with eight-day itineraries typically going as far as Rouen before reversing course, and 11-day trips sailing on to Honfleur on the Channel. The season runs from March through December; beware of wet, chilly Atlantic weather in cooler months.