If you do get the chance, to go up to Jungfraujoch: The Top of Europe. SBB will take you up to the bottom of the mountain, and then a special train - which is very expensive at CHF150- will take you up to the observatory known as Top of Europe. I was fortunate to get a very special deal, where I commuted all the way from Geneva at about CHF189. There are scientific experiments being undertaken up there, including global warming, pollution, oxygen levels and so on. The view is amazing, absolutely stunning views of glaciers and green, especially in May and September. This is Switzerland at its very best. You can ski, use discs as surfboards in the perpetual snow at 10,000ft. Take in the Eispalast, a beautiful museum of ice carvings, and two levels of viewing, the Sphinx area being the better one. The restaurant is not bad either. This was one of my most memorable trips.