I've been 3 times this year already, the Saturday of Memorial Day and it was empty, granted it was cloudy and cold. Then on Memorial day and it was quite busy but they closed at 7 that day so that kept some crowds away. Then I went this last Saturday for Lagoon-A-Beach and that was pretty slow but the rides themselves were the most packed I've ever seen in my life. So I'd say Friday would be quite busy!