It's the end of the school year. The long-awaited holidays have finally arrived. Petit Nicolas and his family head to the sea and move in to the Beau-Rivage Hotel. At the beach, Nicolas wastes little time making new friends, and they set about causing havoc in the holiday resort. He also attracts an admirer in the form of Elizabeth, a little girl who follows him everywhere. Nicolas is really going to enjoy a holiday to remember.