Join Docent Maria in a 4.7 mile strenuous fitness hike that amounts to about 10,000 steps! The hike begins  Black Walnut trailhead, curbside.  It leads you through the Skyline trail and back again. Be ready for this fitness hike, bring water and wear hiking boots and long pants. Snakes are a factor on these less visited trails. Pedometers optional 🙂