May 1, 2013 - 1:01 PM
You might reconsider a rental car if you will stay in Switzerland the whole time. Their public rail system is remarkable. It is clean, super efficient and goes everywhere you might want to visit. A Swiss Pass covers not only rail, but also buses, boats, cable cars, funiculars, etc. The only exception is privately owned transport, such as the rail and cable lines in the Jungfrau region. The Swiss Pass will get you to Interlaken, but many of the tourist sites (Jungfraujoch, Schilthorn, etc.) can only be reached by private transport, although they do offer discounts for Swiss Pass holders. In any event, you will find automobile operation expensive in Switzerland for things like parking and fuel.
Good luck and enjoy!