"River Mountains Loop Trail This 34-mile paved bike trail wraps aroundthe River Mountains and loops from downtown Boulder City through a part of the Lake Mead National Recreation Area, past Lake Las Vegas, through the outside corner of Henderson, and back. All told, the route presents bicyclists with a challenging and diverse path on which to spend a day. There are even some spur trails from the main thoroughfare that link to Hoover Dam (through a series of old railroad tunnels), downtown Henderson, and beyond. The most challenging portion of the main trail is between Henderson and Boulder City, where a series of three hills—dubbed the Three Sisters—prompt even the fittest atheletesto huff and puff for a while. Services are available at various spots along the trail, and bike rentals are offered in Boulder City and at Lake Las Vegas."