Six Flags Great Adventure Introduces ‘Coaster Power Hours’ This Spring Calling all Roller Coaster lovers! Six Flags Great Adventure is hosting a new event called Coaster Power Hours where riders get a chance to enjoy up to 12 roller coasters during exclusive park hours. On select Thursday and Friday evenings in April and May, the park will be open for the limited time special event that celebrates their world-class coasters. The even also features music, specialty food and drinks along with surprises for guests throughout the night. Coaster Power Hour rides include: Kingda Ka – The world’s tallest and second-fastest coaster;