One of the nicest legs of one of my bike tours was Calais to Crotoy – WW2 bunkers, Napoleans monument, Boulogne was nice, Etaples big casaulty evacuation point for injured WW1, le touquet – etc or you could head in land and do Azincourt – nice little museum and you can walk around he battlefield 1415 as above french nobility 0 longbow 12