It's vacation time for outdoorsy Chicago man Chet Ripley, along with his wife, Connie, and their two kids, Buck and Ben. But a serene weekend of fishing at a Wisconsin lakeside cabin gets crashed by Connie's obnoxious brother-in-law, Roman Craig, his wife, Kate, and the couple's two daughters. As the excursion wears on, the Ripleys find themselves at odds with the stuffy Craig family.

Allie Fox, an American inventor exhausted by the perceived danger and degradation of modern society, decides to escape with his wife and children to Belize. In the jungle, he tries with mad determination to create a utopian community with disastrous results.