It is rewarding and there is enough to do from the trailheads. But as no motorized transport is possible, the more remote areas of the park are only possible with overnight trips, which is a special cup of tea.... -20 C in a tent is something different. And if you are down there, you will have to make your own tracks. Depending on the snow, it may be really difficult.... As I said, the access is easy, four hours or so on the frozen lake!
We have been lucky, one night was again a spectacular aurora night. Very special due to the nearly full moon. Normally full moon will kill aurora photo opportunities, to much light. But this time, it was just amazing. Alone in the middle of nowwhere, just me on snowshoes!