Curves and curves, very nice trip. End your trip at 'Bygdas hjerte' for the biggest icecream in this part of the country. From Skotterud you can return to Mysen through Sweden (also nice trip) or travel to Oslo though Kongsvinger.
Start off with nice curves to Eresfjord. Spectacular road along Eikesdalsvannet (quite some tunnels) leading to fantastic Eikesdalen with the waterfall Mardøla. Extreme climb making Trollstigen look pale with nice scenery over the mountain (gravel road). Trip down Litldalen to Sunndalsøra is also stunning.
Short, but nice divertion when driving 21 northbound towards Skotterud.