Dias Ridge Fire Road is a 8.6 mile moderately trafficked out and back trail located near Sausalito, CA that features beautiful wild flowers. The trail is rated as moderate offers a number of activity options. Horses are also able to use this trail.
Singletrack that offers expansive views of West Marin and San Francisco. You can either start the trail near Four Corners in Mill Valley along Panaramic Highway and descend to Muir Woods or vice versa. Note: This trail has been converted from a fireroad to a singletrack. IT'S NO LONGER A FIREROAD Great single track that sees a lot of mixed usage. Mostly mountain bikers, some hikers, and a few horse riders as well since the trail ends at a horse stable in Muir Beach. Everyone seems to be friendly to all trail-users as I have never experience any issues with anybody on the trail. Nothing but smiles and people enjoying the beautiful scenery. The trail is 3.1 miles so if you do it as an out-and-back it's 6.2 miles total. Descending from Four Corners, it begins as a smooth single track and slowly becomes slightly more rocky. Towards the end of the trail, there are many tight switch-backs, water bars (read: pay attention if you're on a bike). As mentioned, the trail ends along Hwy. 1 at a horse stable and directly accross the street from the Pellican Inn (great place to grab some food and a beer). Muir Beach is also a short .5 from there and the Zen Gardens are right around the corner. Miwok Trail, Middle Green Gulch, and the Coastal Trail are all easily found from this trail.