LeRoy collaborated with Hardwicke Industries, who previously built safari parks in Canada and Europe. Together, they set out to open the seven parks in stages over a 5-year period. After a 4,500 invitation-only guest opening on June 30, 1974, the Great Adventure entertainment complex opened to the general public on July 1, 1974, at a price tag of $10 million. At the time of the opening, only the "Enchanted Forest" and "Safari" parks were operational, with elements from five of the other planned parks being used to create the Enchanted Forest.