Noise wouldn't be an issue because, unless there is a special event, waterparks at night are super unpopular. Leading into the park's opening, UOR advertised the crud out of the park's nighttime capabilities and lighting package. While VB wasn't open as late as the dry parks, it still was open after dark, and the park was reliably dead. It could have been a day where Krakatau had upward of a four hour wait, and even it would be "Ride Now" at the end of the night. There is something inherently unappealing to the general public about going toa waterpark when its dark and chilly out and the sun isn't there to dry you off. Plus (#hottake) outside of the Volcano itself and the kid's play area, the nighttime lighting package isn't good.