N.J. Stat. § 40:37-253: Acquisition and improvement of other lands

In any county of the second class wherein lands have been acquired, developed or improved, the board of chosen freeholders may acquire, in fee or otherwise, by gift, grant or devise, other lands and rights in lands for public parks and recreation grounds and develop, improve, maintain, preserve and care for the same as a public park or parks and recreation ground or recreation grounds.

Nothing in this article contained shall be construed to apply to any county of the second class, which has adopted the provisions of any other law for the establishment and maintenance of a county park commission.