Abisko in Swedish Lapland is one of the most northern outposts in Sweden
The town has less than 100 inhabitants, but yet it is a popular hiker/adventurer/skier destination. Most people stay at the Abisko Turistation, run by STF. Essentially a youth hostel, but it has a very good restaurant, shop, sauna, etc. http://www.abisko.nu/vinter/englishpages/index.asp# There are many activities you can sign up for, from skiing trips to dog sledding, or reindeer sledding tours with Sami guides. Between 8pm and midnight the Aurora Skystation is open, just a short walk from the Turistation, albeit it is darker than dark, and a little LED light is necessary to see the road/ice you are walking on. Once you pay at the bottom of the mountain (and if needed took one of their provided jackets and boots), you are strapped into a chair, blanket over your legs, and the next 20 minutes you ascend the mountain in the dark, high up, shivering in the -10degree temperatures (that's -23 Celcius). At the sky station you can then warm up, have some tea, get an orientation about the northern lights (science and folklore), and then you head outside to hopefully catch the elusive northern lights. The viewing is very good from that particular mountain, as there is little to no light pollution from towns nearby. The above picture shows the aurora captured with a long exposure, to the naked eye the effect was much more subtle. Isabelle, this is from the second night, when I met your parents up on the mountain again! Ahh, green skies, but no feeling left in your toes and fingers.