Knipps is right, it is Camp No-Be-Bo-Sco in Blairstown, New Jersey. You can call the managers of the camp to visit it during the off-seasons because it is owned by the Boy Scouts and is still functioning. However, if you go there, there is a Jason mask and a sign that says Camp Crystal Lake with information about the movie and the filming of it there. Here is a link to a website with cool pictures of then and now shots and has some information.
http://www.fridaythe13thfilms.com/bt...ons/part1.html