Then time fro coffee at the Sennespielplatz playground at Männlichen. The giant cow slide is surrounded by swings, a seesaw, spinner, bowling, and a rope swing that you can also lie back and relax on in the sun.
Then back on the Panorama trail to Kleine Scheidegg, with easy walking over 4.7 km, (about 2 hours with children) and gradually descending about 200m. The trail is OK for all-terrain strollers with big tires. There are cafes at Kleine Scheidegg but nothing along the way. The train ride back to Wengen and Lauterbrunnen would be a better choice rather than walking if your children are small. And a faster route to the next playground in Wengen J