Paris Plage is kind of fun, even at night, since people are still walking around these warm nights, enjoying the beach, and it's well-lit for tripod photography.
But rather than shoot on the beach, where the guards have different opinions about using a tripod, and what you are allowed to shoot, there are nice angles from the bridges and upper quays, including of the night-lit Eiffel Tower they've constructed there, with the real Eiffel in the background.
So, I propose a tripod night shoot, beginning at sunset, which is at 21h30 p.m., and continuing for two hours. We may wander off to other sites, like Notre Dame, in the central city, but let's at least start at Paris Plage.
Meeting point, one hour earlier (20h30) at Bistro Marguerite, which is directly across the esplanade from Hotel de Ville, on the Seine side. It's where the Quai de Hotel de Ville and the Quai Gesvres meet. I picked it solely because it's a nearby place for a drink, and we can talk about techniques, cameras, tripods, etc., and get acquainted, rather than have drinks afterward.
So, bring a long lens or a long zoom, and definitely your tripod and camera. Bring a light jacket or sweater, since the temps could dip as low as 18 at that time of night.