I am taking a trip to Norway in October. We are flying into Bergen, spending a few days, and then going to Oslo. Would it be a good idea to rent a car while we are in Bergen to explore areas outside of the city? Also, would it be better to drive to Oslo or take the train? I have heard great things about the train from Bergen to Oslo, however, I don't know if it would be better to have the option to stop along the way and take in the sights.