Tromsø sits on a small island about 350 km north of the Arctic Circle, a city of around 80,000 people between fjords and mountains, with a university, a cathedral, a brewery and more nightlife than anywhere else this far north. In the 1800s it was the base for Arctic hunters and polar expeditions, the "Gateway to the Arctic": Amundsen and Nansen recruited their crews here, and in 1928 Amundsen took off from Tromsø's harbor on the flight from which he never came back. Today it's the capital of Northern Norway, and since the 2010s the world's most famous place to see the northern lights.
The year here swings between two extremes. From late November to mid-January the sun doesn't rise at all, the polar night, but the days have a few hours of deep blue and pink light, and from September to early April the dark skies bring the aurora. From late May to late July the sun doesn't set, and people hike, kayak and barbecue on the beaches at midnight. Most visitors come in winter, so this plan is built for the aurora season, with notes on what changes in summer.
The plan keeps the evenings free for the northern lights. Day one is the town, its polar history and a first aurora chase, day two the Arctic Cathedral and the cable car, day three a Sámi reindeer camp and the town's history, day four huskies and the fjords of Kvaløya, and day five a fjord trip, the art museum, the university museum and the beach at Telegrafbukta. Tours sell out in winter, so book the big ones before you arrive. For the bigger picture, see our page on Norway.