The National Park Service, under the direction of the Secretary of the Interior, is charged with the administration of the area of said national monument, so far as it applies to the care, maintenance, preservation and restoration of the prehistoric ruins, or other features of scientific or historical interest within the area, and shall have the right to construct upon the lands such roads, trails, or other structures or improvements as may be necessary in connection with the administration and protection of the monument, and also the right to provide facilities of any nature whatsoever required for the care and accommodation of visitors to the monument.