Oslo City Hall
Oslo is the capital of Norway and the second most expensive city in the world after Tokyo. Additional port guide here - http://www.cruise-norway.no/Ports/Oslo/Default.aspx
Where You're Docked
Cruise ships can dock at several piers in central Oslo including Akershus Fortress (1/4 mile southeast from City Hall), Filipstadveien (1/2 mile west of City Hall), or Vippetangen (south of Akershus). Akershus has a small cruise terminal building with some shops and a snack bar. The tourist info booth was closed in 2014 so you will need to go the the main office at Central Station. You can check the cruise schedule here (Port Info -> Cruise List) http://www.oslocruisenetwork.no/ or http://www.oslohavn.no/en/passengers/passenger_traffic/cruise/
Money and Tipping
A 24 hour transit pass covering bus, tram, metro (T-bane) and ferries in Zone 1 (Oslo) is 90 NOK and can be purchased at 7-Eleven, Narvesen convenience stores, or ticket machines by the stops. There is a Ruter Trafikanten (customer service kiosk) on the pier at Aker Brygge. Ticket machines may require chip and pin credit cards for payment. Within zone 1, single fares are 30 NOK prepaid or 50 NOK onboard and good for all journeys within an hour (May 2015). You may only need to take public transport if you want to go to Vigeland Sculpture Park, Holmenkollen Ski Jump or the Viking Museum. Most other sights are within walking distance of City Hall. Oslo transit website in English here https://ruter.no/en
With the high prices on everything, consider buying an Oslo pass which give you free entrance to most museums and a public transit pass. This pass can be purchased from the Tourist Info Center (corner of Central Station). An adult pass is 320 NOK (160 NOK children and seniors) for 24 hrs. Discounts for cruise passengers are no longer offered. http://www.visitoslo.com/en/activities-and-attractions/oslo-pass/
Search hotels in Oslo here
Must See Sights
Oslo's main street, Karls Johan Gate runs from the Royal Palace to the train station passing City Hall, the National Gallery, and the Parliament. It becomes pedestrian only east of the parliament.
Aker Brygge is a new development with a waterfront promenade west of City Hall.
Holmenkollen Ski Jump is a manmade facility and free with the Oslo Pass. A little bit out of the way but you can easily take the T-Bane from Nationaltheatret station using line 1. Fare is the same as other transit options and Holmenkollen station is within transit zone 1.
There is a post office inside Central Station.
Try cafes for wifi though coffee will be expensive. Burger King may also have free wifi (Aker Brygge or Karls Johan Gate pedestrian section). The tourist info office at Central Station has free wifi as well.
Maps (right-click to save)
Oslo Weather Forecast
Suggested Port Guides