Hiking:Up to the Mannlichen: a nice quiet track as the less energetic all take a cable carTo Wengenalp for some fantastic viewpoints down the Lauterbrunnen valleyDown to Lauterbrunnen. You can either take the train or hike down, and once in the valley there are flat trails with waterfalls on either side.Take the train up to Kleine Sheidegg and hike down to Grindelwald.
Up to the Mannlichen: a nice quiet track as the less energetic all take a cable car
To Wengenalp for some fantastic viewpoints down the Lauterbrunnen valley
Down to Lauterbrunnen. You can either take the train or hike down, and once in the valley there are flat trails with waterfalls on either side.
Take the train up to Kleine Sheidegg and hike down to Grindelwald.
Swimming: The outside swimming pool has amazing views of the Jungfrau and glacier, there is a very friendly bar and cafe there and the water is refreshing!
Ice skating and curling: Check out the local ice rink.
Shopping: The shops and bakeries are all too tempting.
Note that the town is quiet though, especially in summer, and not the best location if you are into wild clubbing.