If you going to have a half-day sightseeing, I would recommend you to have a city tour by foot for 3 hours, showing the city center, i.e. Aker Brygge, the Royal Palace, the Parliament, the University, the main streets, etc. You will also visit a medieval Fortress ‘Akershus’.
You can have a first class lunch in the stunning Aker Brygge water front (you choose fresh seafood or reins dear dish) or Grand Hotel (Nobel piece prize winners stay and dine there too).
A 4 or 5-hour tour will include at least one or two museums. It is most likely to be the Vikingship museum, Kon-Tiki museum, City Hall (Nobel Peace Prize), the National Gallery (E. Munch, Norwegian landscapes, French Impressionists etc) or Vigeland Park (Sculptural Park)
There are 50 good museums in Oslo, so you can choose one or two. Or might have some special wishes. And there are good restaurants too! Please feel free to ask any questions you may have. I will be happy to assist you in Oslo.We’ll visit the medieval Akershus fortress area, then down to Kvadraturen, which is the city center of the 17th century, continue to Bjørvika waterfront to see the Ekeberg area and the new Opera House, then to Oslo of the 19th century: the Royal Palace, the Parliament, the main streets etc. I will show you a new beautiful waterfront area of central Oslo with the world famous Astrup Fearnley private art museum etc. Then we could visit the National Gallery (to see E Munch painting and French impressionists there) or take a tram to the Vigeland Sculptural Park (it will take us 10 min by tram to get there).