This short connector trail, lined by lovely trees, links the Mason Street bike path to the east Crissy Field parking area. It'll take you by Crissy Field Center, the Parks Conservancy's urban environmental education center in partnership with the National Park Service and Presidio Trust.

This access trail to Rancho Corral de Tierra connects visitors with the Spine Trail. Along the way, it takes visitors past the Ember Ridge Equestrian Center; you're free to look but please don't disturb the horses (or the staff!).

Located in the Marin Headlands north of Rodeo Lagoon, Fort Cronkhite is a former World War II military post that stands at the edge of the Pacific Ocean. Fort Cronkhite is one of the few examples of these World War II "mobilization posts" remaining in the country.

To get to the trailhead, you'll need to make your way into the Green Gulch Farm. Go past the left side of the farm, and you'll start an ascent.

This short trail segment connects Rodeo Beach with Battery Alexander, one of five powerful batteries built by the U.S. Army around the turn of the 20th century. Those guns, manned by soldiers at nearby Fort Barry, were emblematic of the "Endicott Period" of coastal defense technology.

The Spine Trail is a great way to experience the remoteness and wild beauty of Rancho Corral de Tierra.

Park along Etheldore Street, then hoof it down Ranch Road toward the Ember Ridge Equestrian Center (don't disturb the horses...or the staff, please!).

The Stapelveldt Trail starts at the busy Pantoll Trailhead. Head downhill towards the southeast along a deep ravine into a verdant, dense wood. Cross the TCC Trail and continue downhill through the same valley filled with with tall redwoods and large sword ferns.