Staying at the very touristy town of Interlacken (or smaller and yet more touristy Grindelwald) I drove up several mountains. The Trümmelbach waterfalls are nice to visit. There's also a train leaving Grindelwald to the top of the Jungfrau Joch which is the highest train station in the world. It costs a fortune (as so many other things in Switzerland) and I found it underwhelming, mostly because the scenery looks much more exciting from below than from the summit where you can only see the icy summits around.