The Heffleys plan to travel to a tropical island for leisure and relaxation due to the chilly weather and the stress of the approaching holiday season. Greg and his frantic family will benefit greatly from a few days in paradise. However, the Heffleys quickly learn that paradise isn't all it's cracked up to be. The family's vacation is threatened by sun poisoning, stomach problems, and deadly creatures. Is it possible to preserve their trip, or will their island vacation end in disaster?