hi there,
Most of the National Parks in Finland are located in the South but even if you decide to stay in Helsinki there is a good choice. Nuuksio National Park is one of Finland’s most highly-visited parks, is easily reached by bus from
Helsinki, and it is a great place to do some
camping.
Also, in Nuuksio Park you can also enjoy some golf in the summer or cross-country skiing if you travel in the winter.
Hope this helps
Vacationbuddy