This summer I have trip to Europe partially booked. For privacy reasons, I will not tell you all the places I will be going to. I have already booked the flights in and out of Europe, hotels and some of the train tickets. Two of the cities I will visit in Europe are Paris (I already booked the hotel for that) and Zurich, the latter of which I will be flying home from.
I plan to visit another city in between Paris and Zurich and I am having a hard time deciding between either Geneva or Strasbourg (or the general areas respectively). Unfortunately, I will not have time to visit both. So which city (and its vicinity) should I visit?
Also, what are some travel tips and other things I should know about the cities mentioned?