In reply to TobyA:
I haven't been to the ice festival, but I spent a week there one Feb photographing the aurora. The (mini) canyon is small, though as Toby states there will be much more stuff over the border. There will be no shortage of ice, when I was there night time temps were regularly hitting minus 30c.
Interesting part of the world to visit, and a very high chance of seeing the aurora if you go there (which is why I chose it).
Paul