The Oslo Pass gives you unlimited free travel by bus, tram, underground, boat and local train with Ruter AS and NSB (Norwegian State Railways), within zones 1 and 2 (airport not included as this falls outside zone 2)
It can be used on the boats to Bygdøy (ferry to the Bygdøy museums), to the islands in the Oslo Fjord, or to Asker and Nesodden
The price of the ticket per adult is as follows: 24hrs = NOK445 / 48hrs = NOK655 / 72hrs = NOK820
Things to see:
Viking Ship Museum
Vigeland Park
Norwegian Museum of Cultural History
Munch Museum
Frogner Park
Oslo City Hall
Royal Palace
Norway’s Resistance Museum
Oslofjord
Opera House
Oscarshall
Nobel Peace Center
Oslo Cathedral
Norwegian Center for Studies of Holocaust and Religious Minorities
Oscarsborg Fortress
Tips:
For art lovers, take a trip to Tjuvholmen Sculpture Park, which features works from contemporary artists such as Louise Bourgeois, Antony Gormley, Anish Kapoor
For sculptures and Norwegian art history, visit Emanuel Vigeland Museum