Mammoth Hunters to Canal Builders Educational Hike at Fraesfield Trailhead. Travel back in time in the preserve with PastFinder Don Meserve, former City of Scottsdale archeologist and learn how historic and ancient peoples survived and thrived in this desert area. This Moderate hike covers 2.5 miles over about 2.5 hours. Bathrooms available at the trailhead. Bring water and snacks for the trail. No dogs please.  Arrive 15 minutes before start of hike.