Chain of Craters Road from Devastation Trailhead to to Holei Sea Arch is about 18.7 miles (30 km) one-way, taking about 30 minutes to drive without any stops.
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Try this 2.7-mile out-and-back trail near Volcano, Hawaii.
Check out this 2.1-mile out-and-back trail near Volcano, Hawaii. Generally considered an easy route, it takes an average of 50 min to complete. This is a very popular area for walking, so you'll likely encounter other people while exploring.