Hello Behutti90
You plan to stay 4 days and will even change base during that time? That’s not really recommended. You would better stay in one place for the entire time, e.g. Bern or Lucerne and do all trips from there; this would allow using your time available to the fullest.
With so little time, you can skip Interlaken, it is not worth seeing. Also, Zurich is not a must-see for a first-timer.
I would opt for the 4-days Swiss Travel Pass which allows unlimited travel to all the places (in the Jungfrau area as far as Grindelwald / Wengen Mürren, not higher above), as well as in the cities.
Overall, I believe we will only need tickets for transportation for 2 days.
Okay, and how do you get to Bern? Will you have wings on that day?
Kind regards,
Roland