The Japanese have a word for it: "shinrin-yoku" or forest bathing. It's the sensory experience of being among trees. It's a rich form of physically active mindfulness. Forest bathers are encouraged to put away their mobiles and their headphones, and instead activate all their senses to interact with the forest environment.
It has immediate benefits. A study of Japanese office workers showed a 13% drop in their levels of the stress hormone cortisol after a walk in the woods, and the forest also improved the workers ability to focus and reduced their blood pressure.