From the Los Angeles Times:
Adam Jenkins photographed himself at Crocker Point overlooking the Yosemite Valley. A new study suggests even short hikes may improve mental health. (Adam Jenkins)
Science proves what you suspected: hiking's good for your mental health
“Do not underestimate the power of a walk in the woods: A new study suggests that even a 90- minute stroll in a natural environment can lead to measurable changes in the brain, and may help combat depression.”
http://www.latimes.com/science/sciencenow/la-sci-sn-nature-mental-health-20150629-story.html