Finnish schools do not offer extra-curricular activities within the school except for the scheduled physical education courses, where students do everything from ice skating to playing soccer. There are a lot of opportunities for those who are interested in any kind of outdoor activities. Finland is country with close relationship to the nature with outdoor activities popular and encouraged, particularly snow sports.
Most of teenagers in Finland take part in some sort of after school activity, with the most popular sports being ice hockey together with soccer. There are plenty of local clubs and teams to join, your host family and friends will help you to get involved in something that interests you.
The Finns also have an old, special relationship to music, theatre and dance with a rich history of performance in the country. So for those who like music, theatre and dancing there will be a good chance for you to find something that suits you.