Dave,
Here is the law:
§ 7:25-2.9 Swimming
(a) Swimming and bathing are prohibited on all State Wildlife Management Areas except those designated by the Division where a State appointed lifeguard is on duty.
1. No wading is permitted except for the purpose of hunting, trapping or fishing.
2. For the purpose of this section, the use of such devices as vehicle inner tubes, surf boards, inflatable mats or underwater breathing devices commonly known as “scuba” (self contained underwater breathing apparatus) gear shall be considered as swimming or bathing.
To find all laws in NJ easier than using NJ's own legislature website do this:
Google NJ Administrative Code.
Go to lexisnexis link.
Go to environmental rules, then fish and wildlife rules, then wma rules then swimming.
Keep clicking on the folder icon to expand each section.
Have fun.
Scott