You can go up by train from Wilderswil, find the schedule here https://www.sbb.ch/en/home.html. Plateau is a paradise for hikers, many spots offer very picturesque panoramas. We walked along the route number 2.
Saw several interesting birds.
And marmots
Prices (2018):
The train Wilderswil - Schynige Platte, return ticket - 64 CHF (32 CHF with Half Fare Card)
Getting there: coordinates of paid parking in Wilderswil N 46 39.927 E 7 52.181. Wilderswil can be reached by train from Interlaken or even on foot, the distance is only 2.5 km.