Aursjøvegen
This is a beautiful, but demanding car trip along the Aursjø mountain road. The road is mainly a single-lane gravel road. make sure to take your camera. The road is only open between 1. June until the first snow falls. It is a toll road with a fee of 100 Norwegian kroners for cars. Cars with caravans should not try to drive the road and campers should check if they fit the tunnels and swings. Only 4500 cars/motorcycles come here each year, it is kind of a "secret" - it is a bit off the beaten path. Just the tour to get there from Eresfjord is beautiful. This is also my recommendation, to start in Eikesdalen and end in Litldalen (Sunndal).
You will find some more information about this road online. They have their own web page with information. Parts of the road will go through a biotope reservation (animal life is protected there) but you can drive on the main road and go for hikes as everywhere in Norway.
Two national parks are close (but the road doesn't touch them), you can read more about these online.
As allways while caching, show respect for the environment. Future generations will thank you.
This cache
This is one of the detours along the Aursjøvegen. You can either stop to take this cache and drive on, or you can park your car to get some beautiful view at the Aurstaupet. Your choice.