"This hike leads from the upper Hood Mountain trailhead on Los Alamos Road to Adobe Canyon Road, combining Hike 88 and Hike 89 into a 9.4-mile, one-way shuttle. The strenuous hike leads from the upper reaches of Sonoma Valley, up to the Hood Mountain summit, and down into Adobe Canyon, following the length of Hood Mountain Regional Park. The 2,730-foot Hood Mountain lies on the southern end of the Mayacamas Range between Sonoma Valley and Napa Valley. It is the highest peak along the Sonoma-Napa county line. A short side path near the summit leads to the Gunsight Rock Overlook, a massive array of rocks that sits high above Sonoma Valley. Along the trail are expansive views of the valley and the coastal mountains. On clear days, the views extend from San Francisco to the Sierra Nevada Range. The diverse route winds through canyons; climbs over ridgetops; and passes through open grasslands, mixed woodlands, Sargent cypress, and a pygmy forest of Mendocino cypress. The shuttle car is left at the trailhead along Adobe Canyon Road in Sugarloaf Ridge State Park. The hike begins from the upper, north Hood Mountain trailhead at the end of Los Alamos Road."