Hi all, I am one of Jersey's Ranger's and have worked there over summer's, maybe again this year. Anyway, if you and obey rules you should not have any problems. If you have any questions you can always call the park and ask to speak to a ranger, they will call you back when they can. Weekday's are always better in general, weekends can be quite busy. Nope, even being cert. I have not been in the water there. I just fine most area's like this are good for a nice scuba swim. Maybe this year I will jump in there. Any questions, either PM me or you can contact me @ Jenny Jump State Forest, just ask for Ranger Rich(908)459-0537