N.J. Stat. Ann. § 40:61-22.26

The governing body of any municipality may establish, charge, and collect reasonable fees, rents or other charges for admission to, use or enjoyment of any property now or hereafter developed or used in whole or in part for a public swimming pool. And it may establish, charge, and collect reasonable fees, rents or other charges for any recreational privilege, entertainment or other activity conducted on said premises or any part thereof. The municipality shall keep the accounts thereof separate and distinct from any other accounts of the municipality.