The courtyards and rooftops of the Parisian palace hotels open all summer long: the iconic red parasols of the Plaza Athénée, the formal French garden of the Bristol, the rooftop with a view of the Eiffel Tower at the Peninsula, and the intimate chef's table at the Crillon (5-course menus, 4 guests).
Book directly on the hotels' websites (dorchestercollection.com, oetkercollection.com, peninsula.com, mandarinoriental.com, rosewoodhotels.com) or through the concierge; the rarest tables (the Crillon's Table du Chef) must be reserved several weeks in advance.