Six Flags Great Adventure in New Jersey will open on May 30. It'll be open daily from 9am–4pm, weather permitting. You can make a reservation beginning May 27. Tickets will not be sold at the door. General admission during the week is $15 for those 10 and up, $13 for children 10 and under. General admission on weekends is $20 for those 10 and up and $18 for children 10 and under.