Sweden is wonderful but it is very big. Make sure you have enough days to visit it to not be in a rush all the time and enjoy your journey.
I personally did only the south part of Sweden. Starting with Malmo, then to Stockholm, to the beautiful west coast with its small villages such as Fjallbacka and Smogen.
Nothing better if you want to relax and see some green spaces to go outside of the big city and visit the thousands of lacs, the national parks, and small villages.
You will barely see any population or just a house in the middle of nowhere. I always wondered how they get to the grocery shop!