For the purpose of protecting from disintegration and of improving, beautifying, and preserving the Abraham Lincoln Birthplace National Historical Park or Reservation established under sections 211 to 214 of this title, the National Park Service is authorized and directed to provide for (1) the improvement of such existing roadways, walks, and buildings in such park or reservation; and (2) the planting of such trees, plants, and shrubbery; the construction of such additional roadways, walks, and buildings, and of such fences, parking spaces, drainage structures, culverts, and bridges; and the making of such other improvements, as in its judgment may be necessary for the preservation, beautification, and protection from disintegration of such park or reservation, including the log cabin in which Abraham Lincoln was born and the memorial hall inclosing the same, and which may serve to render such park or reservation convenient for the appropriate use and enjoyment by the public.