; land acquisition; administration (a) Boundary adjustment Section 507(c)(1) of the National Parks and Recreation Act of 1978 ( 16 U.S.C. 460kk(c)(1) ) is amended by striking Santa Monica Mountains National Recreation Area and Santa Monica Mountains Zone, California, Boundary Map , numbered 80,047–C and dated August 2001 and inserting Rim of the Valley Unit—Santa Monica Mountains National Recreation Area and dated October 2017 . (b) Rim of the Valley Unit Section 507 of the National Parks and Recreation Act of 1978 ( 16 U.S.C. 460kk ) is amended by adding at the end the following: (u) Rim of the Valley Unit (1) Not later than 3 years after the date of the enactment of this subsection, the Secretary shall update the general management plan for the recreation area to reflect the boundaries designated on the map referred to in subsection (c)(1) as the Rim of the Valley Unit (hereafter in the subsection referred to as the Rim of the Valley Unit ). Subject to valid existing rights, the Secretary shall administer the Rim of the Valley Unit and any land or interest in land acquired by the United States and located within the boundaries of the Rim of the Valley Unit, as part of the recreation area in accordance with the provisions of this section and applicable laws and regulations. (2) The Secretary may acquire non-Federal land within the boundaries of the Rim of the Valley Unit only through exchange, donation, or purchase from a willing seller. Nothing in this subsection authorizes the use of eminent domain to acquire land or interests in land. (3) Nothing in this subsection or the application of the management plan for the Rim of the Valley Unit shall be construed to— (A) modify any provision of Federal, State, or local law with respect to public access to or use of non-Federal land; (B) create any liability, or affect any liability under any other law, of any private property owner or other owner of non-Federal land with respect to any person injured on private property or other non-Federal land