For a beach holiday in the north of France, Berck-sur-Mer offers everything you could want — except maybe the hot Mediterranean sun of the Midi. The sandy beaches are enormous, there is a casino, and the town is built around outdoor activities: sand sailing, horse riding, water sports, and long walks along the Opal Coast. The ideal place for an active beach holiday.
The towns of Boulogne, Arras, and Lille are not far, and even Paris is within reach for a day trip.