Jan 25, 2016 - 5:33 PM
Hi fisherman rob!
Looking at some of your older posts, I think you're familiar with the Regional-Pass Bernese Oberland, right? This pass has been updated recently and now offers excellent coverage throughout the Bernese Oberland. Trains, buses and boats are for free, and even quite some mountain trips like Brienzer Rothorn, First, Männlichen, Kleine Scheidegg, Schynige Platte, Stockhorn and Niesen. It comes in a 4, 6, 8 or 10 day variant. You can study details through the link I provided. This may just be the pass you're looking for.
If you'll be focusing on just the Jungrau region, you may look into the Jungfrau Travel Pass.
I hope one of these fits your needs. If not, please let us know.