Danielle Panabaker
Maddy
Matt Bush
Barry
Katrina Bowden
Shelby
Jean-Luc Bilodeau
Josh
David Koechner
Chet
Chris Zylka
Kyle
Adrian Martinez
Big Dave
Paul James Jordan
Travis
Meagan Tandy
Ashley
David Hasselhoff
David Hasselhoff
Christopher Lloyd
Mr. Goodman
Paul Scheer
Andrew
Gary Busey
Clayton
Clu Gulager
Mo
Sierra Fisk
Bethany
Matt Lintz
Freckled Boy
Sylvia Jefferies
Young Mother
Jenna Hurt
Rochelle
Rozlyn Papa
Dawn
Alisa Harris
Hysteric / Stocky Woman
Stacy Rabon
Fearful Woman
Nate Panning
Waterpark Patron
Kathy Sue Holtorf
Bimbo Lifeguard
Irina Voronina
Kiki
Ving Rhames
Deputy Fallon (uncredited)
Sarah Wilson
Massacre victim (uncredited)
Katie Garner
Lizzie the Lifeguard (uncredited)
Lilith Fury
Wet T-Shirt Girl (uncredited)
Tabitha Taylor
Lifeguard (uncredited)