Klumpen viewpoint in Namsos
The Coastal Route (Kystriksveien, N17) from Steinkjer outside of Trondheim to Bodø in the North is said to be one of the most scenic drives in the World.
In Brønnøysund you can stop for a hike up to Torghatten- a quite unique tunnel located 250meters above sealevel in a granite mountain with good views of the sea.
From there you can take a ferry to Vega (which I did by mistake and had to wait until the next day to return) which is one of four UNESCO World Heritage Sites in Norway due to the many species of birds that live out on the smaller archipelago islands.
On Alsten Island you will also drive past “the Steven Sisters” mountain range which is seven mountain tops famous for hiking. It was no problem waiting a couple of hours at Forvik ferry terminal where I saw a double rainbow when walking through the cemetary, visited the open air museum and the neaeby peteoglyphs said to be 5000 years old.