Sightseeing in Oslo
There is a lot of things to see in Oslo.
Some like to walk around in the city an figure stuff out by themselves, and some like to get on a bus and get the attractions served. If the last one applies to you, there is a lot of organized tours you can take to see the most of the city.
You can choose between sightseeing in red double deckers, busses, trams, mini-trains, boats, on your feets or on a bike. These alternatives will take you through the city with different approaches, but everyone with their own unique perspective on Oslo. Visit Oslo have list over the the recommended tours in Oslo. Check the link.