Now that I'm up north in Lapland I can say: Of all the wonderful experiences I have had, this is high on the list of one I would have regretted not doing.
First & foremost, plenty of snow. Then the thrilling sweep of the aurora borealis. Driving a dog sled (which is a lot of work - you're standing on the brake a LOT), Snowshoeing. The very nice folks in our group, including Esther from Holland who had trained as a seafarer, which was so charming that I had no intention of telling her the word was sailor.
More to say but it's time for the lecture in the Brown Bear Lounge.