The World's Loveliest Dining Room

Forget the six-course meal and the bevy of waiters swooping around your table. To really savor a beautiful fall evening in Paris, ditch the stuffy, gilded dining room and try a champagne picnic along the Seine or a melon-and-charcuterie potluck on the Champ de Mars. Paris is full of prime public spaces with great views that make superb—and free—locations for private parties. For breathtaking backdrops, the banks of the Seine rank high. Parisienne Amélie Nusse and 14 of her twenty-something friends threw a bachelorette's dinner—complete with tables, linen, candelabras and evening gowns—on a cobblestone quai of the Ile Saint-Louis. "We...