Mar 19, 2016 - 10:46 PM
I would look at this pass:- http://www.swisspasses.com/ railpass/swiss-regional-rail-passes/packages/ 4_bernoberland@specialoffer/
We used it last year (and will again for our 2016) and found it met our needs exactly.
It will give you transfers in and out of Grindelwald and 4 days of travel around all of the wonderful places to visit in the area. There is a 50% discount on travel to Jungfraujoch.
There are 1st and 2nd class options. If you can afford it, with 1st you travel in style on the main routes