For a nice trip up the mountain, walk up to the Gondola (at the upper end of town) and take the ride up to Piz Gloria (the mountain top). If you're there early, they have a "James-Bond" breakfast that is pretty nice. Hopefully the weather is nice - that's when you get a really nice view around the mountain tops of the Alps while the restaurant moves thru a 360-degree revolution to show you everything.
Across the valley is the alpine massive of Eiger, Moench, Jungfrau. There is a train that goes up there to the glacier which terminates in the highest train station in Europe, again with great views. It involves going back down into the valley via the Stechelberg cable cargondola (the same you just took up the mountain - jut the other way), and taking a short bus ride to the "Jungfrau-Bahn" (Jungfrau-railway) station in 'Kleine Scheidegg'.