Within four years from October 21, 1970, the Secretary of the Interior shall review the area within the Sleeping Bear Dunes National Lakeshore and shall report to the President, in accordance with subsections (c) and (d) of section
1132 of this title, his recommendation as to the suitability or nonsuitability of any area within the lakeshore for preservation as wilderness, and any designation of any such area as a wilderness shall be accomplished in accordance with said subsections.