You can

• freely move in forests and meadows by foot, skis or bike.
• temporarily spend time (i.e. camp) in areas where moving is also allowed.
• collect natural berries, fungi and flowers.
• fish with a hook and line.
• move in waters by swimming or boat. 

You cannot

• cause disturbance to others.
• disturb birds' nests or offspring.
• disturb the animals of the forest.
• fell down or damage growing trees.
• collect dead trees or moss without permission. 
• make a fire on another person's property.
• disturb other people by camping near their houses or buildings.
• litter.
• drive a motor vehicle without the land owner's permission.
• fish or hunt without proper permits.

Source: Ymparisto.fi