Jun 22, 2016 - 1:37 PM
Hello Reshma, welcome to MySwissAlps!
There are no buses to Interlaken that I know of. There are several routes from Munich to Interlaken. Most are train only, some include a bus from Munich to Zurich. You can best check the timetable for details.
There is not much in Interlaken that qualifies as sightseeing (like museums, monuments). I would recommend to focus on the surrounding lakes and the Jungfrau region south of town. You'll find lots of details here: www.myswissalps.com/in terlaken.
The Glacier Express does not go to Jungfraujoch. Please see:
Before picking a rail pass, you will first need a detailed itinerary: your route to Interlaken, which day trips you intend to make, and where you go next from Interlaken. The below pages will be helpful:
I hope this gets you started. If you need more help, please feel free to post your detailed plan (dates too please) and questions.