Hirtshals is small town at the northern coast of Denmark.
Ferries towards north
Hirtshals hosts ferry harbours from where you can get to Norway (several destinations), Faroe Islands and Iceland. For detailed information about ferries and all destinations check the websites of: Smyril Line, Fjord Line, Color Line, Nor Lines.
Color Line to Kristiansand: unfortunately payment is per car and per person so you can’t get a free ferry ride by hitching a car. The tickets are cheaper if you buy them online (you don’t need to print them, just write down the reservation code). There is no wifi in the building but there are computers with internet access in “Hyttefadet”, some sort of restaurant just 2 minutes away. (Both the building where you can buy tickets and the restaurant are marked on the map.) (April 2013)
In the restaurant as you go towards the bathroom there is another way you can take towards left, you pass through a room with slot machines and in the end on the right there are 2 computers with internet access. There is also a machine with coffee, hot chocolate, etc. that doesn’t require coins. It's not obvious who is supposed to have access to this area maybe if you keep a low profile you can sneak in without paying anything. (April 2013)
On the ferry (ship “Superspeed 1”) there is an area with reserved tables for truck drivers who can get food (company pays for them and it’s an open buffet with drinks). A truck drivers can take you there and no one might ask you anything. Suman Mircea didn’t see anyone checking people at the entrance to this area, maybe he/she was away but either way if you keep a low profile you could probably just walk in (tables for truck drivers have some sort of “reserved” card on them). This area is towards the front of the ship, possibly on deck 8. (April 2013)
You can walk around even to other areas of the ship without being asked questions; you can use an empty seat in “Business” or “Voyager” class to sleep. It might also be worth spending some time around, the town has a nice 35 metre high lighthouse and is home of one of the largest aquariums in Europe, the Nordsøen Oceanarium.