"Two families arrive in Puerto Vallarta, Mexico, for a once-in-a-lifetime vacation ... Jenna has organized the trip to celebrate her husband's fiftieth birthday--she's been looking forward to it for months. Their friends, the Solomons, can be overbearing at times, but Jenna is sure everything is going to be just perfect--and the margarita refills delivered by the house staff certainly don't hurt, either ... Yet as the families settle into their vacation...