A little bit of every weather while driving from Åndalsnes to Stavanger for 5 days in August. Scenes under bad weather sometimes gave me stronger impression than under the clear sky. However, the most impressive experience was the reflections on the fjord water. When found such place, parked a car while. Lunch at the place was a joy, too.
Private tour with rent-a-car may fit better to my style than package tour. I know many travelers are afraid driving cars other than home country but recommend to the traveler to challenge it once.