Jason Kelly is one week away from marrying his boss's uber-controlling daughter, putting him on the fast track for a partnership at the law firm. However, when the straight-laced Jason is tricked into driving his foul-mouthed grandfather, Dick, to Daytona for spring break, his pending nuptials are suddenly in jeopardy. Between riotous frat parties, bar fights, and an epic night of karaoke, Dick is on a quest to live his life to the fullest and bring Jason along for the ride.
Jason Kelly (Zac Efron) is at a funeral for his grandmother. He runs into his obnoxious cousin Nick (Adam Pally), who is high on drugs. Jason's grandfather Dick (Robert De Niro) requests that Jason drive him to Florida as a personal favor. Both Jason and his father David (Dermot Mulroney) don't like the idea, but Jason reluctantly agrees to help out his grieving grandpa...