Brønnøysund is situated in the middle of Norway, and sports some 7500 inhabitants.
By plane, bus or the Hurtigruta.
Rent a car (150-500 nok /day). It is said that the public communications aren't any good.
Just some 10 kilometers outside of Brønnøysund, you have the mountainTorghatten with it's characteristic hole all the way through.