The Zuni-Acoma Trail is the great traverse of El Malpais — a 7.5-mile (12 km) one-way hike across four distinct lava flows, from the eastern trailhead on Highway 117 to the western trailhead on Highway 53. It is an ancient route. The Zuni and Acoma peoples used it as a trading corridor for centuries before any European reached the region, and the original rock cairns marking the route are still there.
The hike is hard. The lava is sharp, the footing uneven, and there is essentially no shade for the whole crossing. Carry at least four litres of water per person, wear boots with solid soles, and arrange a car shuttle before you start — there is no shortcut back if you change your mind in the middle. Allow six to eight hours and start at dawn. In summer the rock can reach 60°C; the trail is best tackled in spring or autumn.