If your trip to Boulogne-sur-Mer is all locked in but your itinerary is a bit on the empty side, we can give you a helping hand.Plan a stop at Nausicaá National Sea Center. It's one attraction you'll usually find on travelers' must-do lists. If you still have some space on that travel itinerary, Plage De Boulogne Sur Mer and Chateau Musee will keep you entertained too.