Svalbard is a Norwegian archipelago roughly halfway between the mainland and the North Pole, and the easiest part of the high Arctic to reach. Longyearbyen has an airport, hotels and restaurants; beyond town there are no roads at all.
The year splits into three trips. In summer, small expedition ships circle Spitsbergen in 24-hour daylight. From March to mid-May, dog teams and snowmobiles head out across deep snow. In the polar night the sun does not rise at all.
The honest caveat is polar bears. They can be anywhere outside town, so you never walk beyond the warning signs without an armed guide, and there are no tours that seek bears out. Sightings happen from ships, at a distance, and are never promised.