Very pleasant flat, wide trail which used to be the railway path for hauling materials for the building of the Hoover Dam. Free parking in the lot before you enter Lake Mead. Great for hiking, running or biking. Gravel, rocky path so I suggest a mountain bike or Hybrid. You can walk or ride all the way to the Hoover Dam. Bring a bike lock and leave your bike at the top of the parking garage at the Dam and walk across the dam. Great views of Lake Mead, the tunnels and informative signage explaining about the people who lived along the lake while the dam was being built.