This is a spectacular region close to Interlaken, Switzerland where I work as a photographer. You can take the train from Wilderswil up the mountain to the Schynige Platte railway station. The journey up and down the mountain takes an hour with spectacular views on the way. Remember to pull down the window in the carriage before taking pictures.
The Jungfrau Travel Pass for 3 – 8 days will allow you to visit all of the Jungfrau Region and save you money. It’s a great deal. REMEMBER that most of the cable cars, trains etc operate on various months during the summer season. Check the websites and ask at the tourist office about what areas are open or closed.