May 25, 2018 - 8:26 PM
I agree about the Bernese Oberland pass. I used one in 2015 and made many different trips, sometimes on trains buses and boats not so often used by international tourists.
An example is the bus from Brienz to Axalp. It can easily be combined with a boat trip on the Brienzersee.
You could consider a regular ticket to either Bern or Luzern to start using the pass. Your return to Basel could be on the other route.
You'll definitely need an extra ticket to get ride the Jungfrau line but all other travel should be covered.
I feel it's better to focus on a region if only in Switzerland for a short time rather than an exhausting itinerary that tries to do too much.
Enjoy your travels