In furtherance of sections
1,
2,
3, and
4 of this title, which directs the Secretary to administer units of the National Park System in accordance with the fundamental purpose of conserving their scenery, wildlife, and natural and historic objects, and providing for their enjoyment in a manner that will leave them unimpaired for the enjoyment of future generations, the Congress hereby finds that the preservation and conservation of park resources and values requires that such public accommodations, facilities, and services as have to be provided within such units should be provided only under carefully controlled safeguards against unregulated and indiscriminate use, so that—