Schools out, and Fred Figglehorn's dream of water slides, horseback riding and monkey butlers during the summer turns into a nightmare of gruel and poisonous berries when his mom signs him up to an unsanitary camp.

Shy 14-year-old Duncan goes on summer vacation with his mother, her overbearing boyfriend, and her boyfriend's daughter. Having a rough time fitting in, Duncan finds an unexpected friend in Owen, manager of the Water Wizz water park.