From Six Flags Great Adventure & Safari:

Enjoy thrills and activities for the whole family throughout the day and come back for a truly frightening evening of fun after the sun goes down. Fright Fest offers a wide variety of places to get your scare on including seven haunted mazes and five scare zones located throughout the park. The stuff of nightmares lurk around every corner as the dark of night washes over the park. The ghouls are set free for their daily hunting rituals.

More information.