The “Oslo Pass” is a great discount card when traveling to Oslo.
The Oslo Pass gives you free entry to over 30 museums and attractions, free public transportation, free parking at municipal sites, free access to the outdoor swimming poosl, free walking tours, discounts on sightseeing tours, Daisy, ski simulator, ski rental, and special offers in restaurants and shops.
You can buy a Oslo pass discount card that is valid for either 24, 48 or 72 hours.
The prices are:
Adults: 24 hours: 270 kr 48 hours: 395 kr 72 hours: 495 kr
Children: 24 hours: 120 kr 48 hours: 145 kr 72 hours: 190 kr
For more information: http://www.visitoslo.com/no/aktiviteter-og-attraksjoner/oslo-pass/