When two weddings are ruined by both the bride and groom getting left at the altar, they still decide to take their honeymoons, not knowing they are heading to the same resort in Hawaii.

A struggling tourist hires two wannabe tour guides to take her to an active volcano.

Mike and Dave are young, adventurous, fun-loving brothers who tend to get out of control at family gatherings. When their sister Jeanie reveals her Hawaiian wedding plans, the rest of the Stangles insist that the brothers bring respectable dates. After placing an ad on Craigslist, the siblings decide to pick Tatiana and Alice, two charming and seemingly normal women. Once they arrive on the island, however, Mike and Dave realize that their companions are ready to get wild and party.