Trail through old-growth redwoods and river, Muir Woods National Monument

redwoods muir woods national monument trail oldgrowth redwood creek sequoia sempervirens coastal redwood national park service environment pacific coast california hiking trail john muir mill valley golden gate national recreation area mount tamalpais ancient nature preserve lush timber forested park redwood trees forest forested marin county park nature outdoors fresh air us usa united states ecology woods forestry wilderness scenic national park environmental picturesque serenity green evergreen verdant greenery tranquil oldgrowth redwood