This is an embarrassingly small sampling of the hikes in Marin County, but it happens to be among the best of the bunch (I lived in the South Bay and it was hard to justify driving to Marin when I had so many fine trails nearby).
View Marin Range hikes in a larger map
Marin Headlands | THD day hike (1).
Muir Woods loop via Steep Ravine and Bootjack trails | THD day hike (1).
Mount Tamalpais loop: Dipsea, Steep Ravine and Matt Davis trails | THD Day hike (1).
Palomarin Trailhead to Wildcat camp | THD day hike (1).
Cataract Creek Falls: THD day Hikes (2).
Tomales Point Trail. THD day Hikes (3).
Other Two-Heel Drive hikes, by region: