The easiest way to get to Copenhagen from Oslo is definitely my taking a DFDS boat, or a so called Danske Båten. It also must be the funniest way to do it as drinking is an obligatory attribution of eat. Arriving to cold and windy Copenhagen on Sunday morning is a tiresome rather than sobering experience. However, the city is always beautiful, especially the Nyhavn area with it's colourful facades.
We almost got tired counting all the VW busses on this DFDS boat model
An icy Oslo Fjord