In reply to dan bulman:
The coast from Calais all the way down to Le Havre by way of Boulogne and the Somme Estuary is far more interesting than people think. With a bit of research you can find good cliff top walks, old forts, walled towns, interesting harbours, beaches, extensive mud floods and bird reserves, restored steam railway, British and Chinese War Graves cemeteries, English Arts and Craft house, Monet seascapes, etc . . .
Don't hurry past!