Tucked almost directly beneath the Golden Gate Bridge, this former army post is on the threshold of the dramatic coastline of the Marin Headlands.

Tennessee Valley is an amazing offshoot of the Marin Headlands, with hiking trails that suit the whole family.

Stretching from Mill Valley to Stinson Beach, the famed Dipsea Trail is for hikers looking for a challenge.

Surrounded by urban development in Pacifica, Milagra Ridge forms what biologists call an island ecosystem.