What is the best way to see Paris at night?
Prefer to see the bridges and major landmarks.
We did Bustronome https://www.bustronome.com/ some years ago and it was marvelous. Great views and surprisingly good food. If you are there in summer, though, it might not be dark enough.
We have visited Paris multiple times. In the past, we have taken one of the evening Seine cruises and you do get a wonderful view of the major landmarks along the Seine. However, depending upon the timing of the cruise, you may not be able to see the twinkling lights of the Eiffel Tower. It is a nice affordable way to see many of the sights.
Last June we took the Pinky vintage car evening tour: https://pinkytourparis.com/en/2cv-vintage-car-tour-paris-by-night/. It was a magical experience. The vintage Citroen convertible was such a unique way to see Paris, we went through the Left Bank (even stopped at the Emily in Paris apartment and Gabriel’s restaurant for photos), Marais, drove along the Seine past the major landmarks. We reached the Eiffel Tower just before the lights twinkled and our driver stopped traffic just so we could get the perfect picture, drove past the Arc de Triomphe at night, ending our evening with a picnic at the top of Sacre Couer. Since it was early June, our dinner was quite late, but it was such a magical experience. Our guide picked us up and dropped us off at our hotel. He was so knowledgeable about the city and had a great sense of humor. It is a bit pricey from a 3 hour tour, a 165 euros per person, but extra for wine and cheese. We were so glad that we started our trip with this tour.
A 1 hour cruise on the Seine. Vedettes du Pont Neuf or whichever cruise is convenient for you. Most of the companies time the cruise so you see the twinkling Eiffel Tower.
If you're willing to take public transportation, do a self tour for a few Euros. Head to the Place du Trocadero for the jaw dropping view of the Eiffel Tower in all its glory. Then take a short bus or metro ride to the Arc de Triomphe. Then hop on the 63 bus to Pont Alexandre III for the illuminated Golden Dome of Invalides and the bridges across the Seine. From there you can walk along the river and cross the Pont de la Concorde to Jardin des Tuileries and the Louvre. Continue walking or take one of several buses to the Ile de la Cite and see the floodlit Notre Dame. There is more to see, but I'll stop here.