From Greenfield you can reach Pinnacles National Park by road for hiking, rock formations, and talus caves that reward drivers who park and explore on foot. The Nacimiento-Fergusson Road offers a memorable scenic drive with overlooks and twisty pavement suitable for experienced RV drivers who are comfortable on mountain roads. U.S. Highway 101 provides the main, direct route in and out with wide lanes, frequent travel plazas and fuel stops that ease navigation for larger rigs. These routes let travelers based in Greenfield tailor day trips to short hikes, winery stops, or coastal out-and-back runs.