Right before his wedding, straight-laced Jason Kelly (Zac Efron) is coerced into driving his foul-mouthed and perverted grandfather Dick (Robert De Niro), a former Army general, to his Florida vacation home.

Little does Jason know, Dick has other plans for their trip. On the way, they run into some girls who invite them to Daytona Beach for Spring Break, a detour to which Jason warily agrees.

What follows is a rampage of drugs, alcohol, gratuitous nudity and sex -- definitely not the road trip that Jason, or even Dick, thought it was going to be.