Tromsø is a city in Norway that offers a variety of activities and attractions for visitors. Here are some things to do in Tromsø based on the search results:

• Take the Fjellheisen cable car: This offers great views of the city and is a popular activity for visitors.
• Visit Tromsøbadet: This is a big indoor swimming pool complex with several different swimming pools, jacuzzis, a sauna and steam room, and a heated outdoor pool area with beautiful views.
• See the Northern Lights: Tromsø is a great place to see the Northern Lights, especially from September through mid-April.
• Go ice skating: If you visit Tromsø when its cold enough for the lakes to freeze but not too snowy, youll find most of Tromsø out ice skating on the weekends. You can rent ice skates downtown and join in the fun.
• Go snowmobiling: Snowmobiling is incredibly popular in Tromsø, and there are many snowmobile tours offered out of Tromsø.
• Go hiking: Tromsø offers many hiking options, especially in the summer. There are so many hiking options here, and if youre coming earlier in the summer, you can ask around for where isnt too snowy.
• Visit the Arctic Cathedral: This is a famous landmark in Tromsø and is known for its unique architecture.
• Visit the Polar Museum: This museum showcases the history of Arctic exploration and is a great place to learn about the regions culture and history.
• Take a fjord cruise: Tromsø offers fjord cruises year-round, which provide a great way to see the surrounding scenery.
• Try local cuisine: Tromsø has a range of restaurants that specialize in fresh Arctic ingredients, so its a great place to try local cuisine.

These are just a few of the many things to do in Tromsø. Other popular activities include dog sledding, reindeer sledding, visiting Tromsø Ice Domes, and more.