We can and must still enjoy our natural environment. However, we may wish to avoid the most popular hiking destinations and give preference e.g. to a forest close to our home. On Metsähallitus website, you will find guidance for hikers relating to the coronavirus. Metsähallitus wishes to remind that the same rules apply in the natural environment as in urban areas and shopping centres:  two-metre safety distance and good hand hygiene is always required, including in campfire and rest sites.
See also Nationalparks.fi: Guidelines Concerning Coronavirus