I had coffee at an outdoor restaurants on the canyon edge and wondered whether there was any place on earth more beautiful. Winter in the Jungfrau region is for skiing, and summer is for walking. The Swiss know how to do it. Take a cable car or cog train to a high valley, then walk on a mostly level or descending trail. Stop for coffee and the view.
Trails are well-marked for the most part, signs showing directions and degree of difficulty.
If you're confused, ask a passerby. On a walk to Spielboden, above M rren, we came to a poorly-marked turning. An elderly woman was walking slowly up the path behind me. She was wearing a dress and carrying a shopping bag, obviously a local who had climbed this hill countless times. I said, pointing up the path.