Within three years from December 18, 1971, the Secretary of the Interior shall report to the President, in accordance with subsections 3(c) and 3(d) of the Wilderness Act [
16 U.S.C.
1132 (c) and (d)], his recommendations as to the suitability or nonsuitability of any area within the park for preservation as wilderness, and any designation of any such area as a wilderness shall be in accordance with said Wilderness Act [
16 U.S.C.
1131 et seq.].