(Courtesy: Six Flags Great Adventure) JACKSON, N.J. - Six Flags Great Adventure has announced they'll reopen Friday, July 3 with new safety measures in place.Tuesday, New Jersey Governor Phil Murphy announced the state's water parks and amusement parks could reopen at 50% capacity on July 2.Six Flags says they'll be waiting an extra day to open up for the 2020 season in accordance with the state's new operating guidelines.They say operations beginning July 3 with reduced attendance levels will serve as a "preview mode" and will open be open to members and season pass holders until Saturday, July 4.The park then plans to gradually increase attendance levels throughout the month.Both Six Flags Great Adventure and Hurricane Harbor will.