Mar 6, 2017 - 4:34 PM
in reply to Nayab
Hi Nayab and welcome to MySwissAlps!
For train passes, the 4 day Swiss Travel Pass should work quite well for you. It will cover all train routes you described and public transit in each of those towns (except only a 25% discount on the route between Wengen and Jungfraujoch).
For ideas in what to do in some of your destinations look here: Interlaken, Luzern (local German spelling) and Zurich.
Day trips can be made to Jungfraujoch and Luzern from Interlaken are possible. Although you may find a few things to do in Luzern that will make it easier if you stay there (such as Mt. Pilatus and Mt. Titlis).
I hope that points you in the right direction. Let me know if you have further questions about your trip!
Last modified on Mar 6, 2017 - 4:58 PM by Arno