SO many wonderful things to do/see. For only two days my top picks are:
1. Männlichen to Kleine Scheidegg walk. Take gondola from Wengen to Männlichen and spend some time admiring the views from there. Then enjoy the positively stunning easy 3.5 mile downhill walk to KS. Panoramic views of Eiger, Mönch, and Jungfrau. Once at KS take a seat at one of the communal tables by the train tracks and enjoy a really great lunch overlooking the glaciers. Top picks from the menu are Rösti (with optional ham, egg, and/or cheese add ons) and the apple cake with cream (Apfelkuchen mit Rahm). To NOT skip the cream. Both of these items are large enough for two people to split.
2. Lauterbrunnen to Stechelberg, optional to Mürren. This is another must-do hike as it provides a glorious trip down the entire Lauterbrunnen Valley and beyond. The Lauterbrunnen to Stechelberg segment is an easy, four mile long flat walk and truly a “trail for everyone”. The valley is full of waterfalls – the literature claims 72 but, depending on the time of year, you may see as few as 10. Take the train from Wengen down to Lauterbrunnen, exit left from the train station, walk through town, and directly onto the wide footpath that runs down the Valley. The path is paved about half of the total distance from Lauterbrunnen to Stechelberg then turns into a wide and well-graded dirt and gravel path that parallels the Weiss Lutschine river. Soon after leaving Lauterbrunnen you will pass right by the famous Staubbach Falls. In fact, along the trail there are markers at all of the major falls enroute with interesting details about each.
About 45 minutes into the walk you will see a cut off (to the left) that leads across the Valley to Trümmelbach Falls. This is well worth doing -- these are falls that run through the center of the mountain and it is all very dramatic. Secure footing and railings let you get an up-close look. (Fee for entry.) After touring there, you can either walk on the road in front of the falls down to Stechelberg (continuing south) or, preferably, cut back across the meadow and rejoin the footpath.
Another 30 minutes or so after rejoining the footpath you will come upon the Stechelberg-Schilthornbahn station where you can catch the gondola up to Mürren.
If you wish to continue the walk, I highly recommend heading onward to the Stechelberg Inn, which lies at the end of the Valley and is a great lunch spot. It’s usually full of locals and they have a nice patio and an extensive menu with top-notch food and desserts.
From Stechelberg gondola station you can ride up to Mürren via Gimmelwald. If you wish, hop off in Gimmelwald to admire the views then catch the next ride (about 20 mins later) on up to Mürren.
Once you reach Mürren you can make this your destination for lunch (if you haven't dined in Stechelberg) and a walk through the lovely village. The views from Mürren are much different than those from Wengen, very dramatic and rocky peaks.
Another option is to stay on the gondola all the way to the Schilthorn. Stay there for an hour (one revolution of revolving restaurant) then return to Mürren. Only go up to Schilthorn peak if the weather is clear.
After you're done touring Mürren you can either take the train to Grütschalp or enjoy the 3 mile flat panorama trail to get there. There is a cable train that will take you from Grütschalp to Lauterbrunnen where you can catch the train back to Wengen.