Off the coast of Florida, a nearly-deserted island is rumored to have the fountain of youth. A boatload of teenage kids are headed there for a scavenger hunt. Wellington, the island's wealthy owner, is none too happy about that, so he dispatches his daughter to get rid of them. She's happy to go because her sweetie, Irving, is the island's only resident. Junior sends him to spy on the kids to find out what they know. Irving's twin brother, Herman, and his high-school sweetheart are also headed for the island with their own nefarious plans.