Disney, Universal & Other Theme Parks Great Adventure Theme Park, Before It Was Six Flags by SharonKurheg January 11, 2018 by SharonKurheg January 11, 2018 In the mid-1970s, a brand-new full-sized theme park opened just off Exit 7A on the New Jersey Turnpike. It was (and is) located in Jackson, New Jersey, mid-way between New … 0 FacebookTwitterPinterestEmail