To save mc friends from death by boredom, this is the best way to travel north from Stockholm to Sundsvall. E4 will take you there in 4 hours, but you will be utterly bored by that fast highway with nothing to see. This route lets you stay off E4 and instead discover medium to small roads taking you to some really nice places. It will take more than twice the time, but you will be smiling all the way.