The Secretary of the Interior and the Secretary of Agriculture shall, insofar as practicable, coordinate and correlate recreational development on lands within the parkway and adjacent or related national forests land: Provided, That within national forest boundaries recreational developments and facilities on Federal lands other than those actually within the national parkway shall be administered by the Secretary of Agriculture;

Upon the request of the Secretary of Agriculture, the Secretary of the Interior shall relocate and reconstruct any national forest roads that may be disturbed by the parkway extension, or provide alternative roads that are necessary to the protection, administration, or utilization of the national forests, and shall allow access to areas to be developed by the Secretary of Agriculture on adjacent national forest lands unless to do so will materially impair the primary purposes of the parkway;

The Secretary of the Interior may relocate and reconstruct portions of the Appalachian Trail, including trail shelters, that may be disturbed by the parkway extension and such relocation and reconstruction may be performed (A) on non-Federal lands when the Appalachian Trail Conference obtains the consent of the owner to the use of the lands for the purpose and agrees to assume maintenance thereof, and (B) upon national forest lands with the approval of the Secretary of Agriculture.