The second biggest national park in southern Finland. Multiple hiking tracks. Website: www.nationalparks.fi/en/sipoonkorpinp
Just step out of the door and you are middle of nature, but if you would like to treck in national park, drive along Immersby road to the Hindsby. There are parking area and marked trails.
Sipoonkorpi national park. Not exactly the untamed wilderness of Lapland but still awesome for those wanting a break from the city. Try not to get lost in the forest please.
Beautiful area to check out the reason why Finland is so interesting to many: wild forests.