a. The department may use for the purposes of the system lands owned by the State, with the concurrence of the head of the administering agency, and acquire scenic easements in such lands by written cooperative agreement, donation, or purchase with donated or appropriated funds, or agree to manage any such lands in a manner consistent with the provisions of this act.
b. The department may enter into such agreements with landowners, counties, municipalities, private organizations and individuals for the use of lands within the designated boundaries of any river area of the system in accordance with the provisions of this act, or may acquire therefor scenic easements by donation or purchase with donated or appropriated funds.