the South Rim is split into two segments. The western drive to Hermit's Point is with several overlooks along the way, including Mohave Point, Hopi Point, and the Powell Memorial. From March to December, access to Hermit's Rest is restricted to the free shuttle provided by the Park Service. The eastern portion to Desert View is , and is open to private vehicles year round. Walking tours include the Rim Trail, which runs west from the Pipe Creek viewpoint for about of paved road, followed by unpaved to Hermit's Rest. Hikes can begin almost anywhere along this trail, and a shuttle can return hikers to their point of origin. Mather Point, the first view most people reach when entering from the south entrance, is a popular place to begin. Private canyon flyovers are provided by helicopters and small airplanes out of Las Vegas, Phoenix, and Grand Canyon National Park Airport. Due to a crash in the 1990s, scenic flights are no longer allowed to fly within of the rim within the Grand Canyon National Park. Flights within the canyon are still available outside of park boundaries. Grand Canyon Conservancy The Grand Canyon Conservancy is an organization dedication to the conservation of the Grand Canyon National Park. Currently, it has four main challenges to complete. Creating Inter-tribal cultural sites Dark Sky Preservation Discovery and exploration of the Park Trail creation and preservation Development The U.S. government halted development of a 1.6 million acre area including the national park from 1966 to 2009, known as the Bennett Freeze, because of an ownership dispute between Hopi and Navajo. Grand Canyon Association The Grand Canyon Association (GCA) is the National Park Service's official nonprofit partner. It raises private funds to benefit Grand Canyon National Park by operating retail shops and visitor centers within the park, and providing educational opportunities about the natural and cultural history of the region. See also (image gallery) List of trails in Grand Canyon National Park List of national parks of the United States References External links Grand Canyon National Park Lodge Historic American Engineering Record (HAER) documentation, filed under Grand Canyon Village, Coconino County, AZ: A 6-minute low resolution video of a flight over the Grand Canyon (1993) 1919 establishments in Arizona Historic American Engineering Record in Arizona Historic American Landscapes Survey in Arizona Parks in Coconino County, Arizona Parks in Mohave County, Arizona Protected areas established in 1919