What time of the day is best to ride the Hop-on Hop-off Bus?
If it is your first time in Paris, probably the best idea is to take the morning tour, as you will see all the landmarks during the daytime and enjoy the best sights of the city. If you already know Paris or you are looking for something different, maybe you should try the evening or night tours and see the Eiffel Tower, the Opera Garnier and Notre Dame all illuminated at night.