I went to Narvik a couple of years back. If you are willing to drag a big heavy caravan above the polar circle this is probably a good place to go. Situated at aprox 68 50 N 17 50 E. Narvik is located at the inner part of ofotfjorden and you can easyli take a daytrip to the north atlantic ocean - beautyfull sight, if you are lucky you might see some whales. From Narvik you can take the train to the swedish national park in Abisko, maybe stay overnight at the icehotel in Kiruna.
http://www.worldisround.com/articles/15463/
Good luck.