Planning trip from Paris to Interlaken to Florence

Hi Linda, and welcome to the forum! When will you be traveling? If it's in Spring or Fall, you can best use the 2 for 1 offer on the 4 day Swiss Saver Pass. If not, I think the Swiss Card may be interesting, providing a free trip from the Swiss border (Basel) to Interlaken, from Interlaken to the Swiss/Italian border (depending on your train connection, this will be Chiasso or Domodossola) and a 50% discount on other trips you'll be making in between. None of the Swiss rail passes is valid for Paris-Basel. Please refer to the detail page of each pass to read specific information and review the downloadable map showing the area of validity.

You can make seat reservations for the entire trip Paris-Interlaken, while paying only for the French leg of the trip up to Basel (from there, your Swiss Saver Pass or Swiss Card will take over). Choose your connection from the Swiss timetable, click 'Fare/Buy' and enter the ordering process. If asked whether you have a discount option for Switzerland, select 'GA' in either 1st or 2nd class (the same class as your Swiss Pass or Swiss Card) from the dropdown list, as the GA provides the same benefits as a Swiss Pass/Swiss Card for this specific trip. The same goes for your outbound trip from Interlaken to Florence.

I hope this helps you out!