This itinerary explores the popular Jungfrau Region near Interlaken. For each day, I've included activities in one mountain area in this region.
I think 3-5 days is the perfect amount of time in the Jungfrau Region. If you stay 7-10 days, I would add days from my Bernese Oberland itinerary.
I've included one day on each mountain area in the Jungfrau Region:
Grindelwald First
Mürren-Schilthorn
Schynige Platte
Männlichen
Jungfraujoch
Pfingstegg
Lauterbrunnen Valley
I include options for different kinds of travelers: hikers, non-hikers, and families. Some days include a lot of activities. If you want a more relaxed pace, spread the activities over multiple days.
Please note the closing times and organize your itinerary carefully so you aren't stressed rushing from one thing to another.