Wyatt Wallace is a practical, super organized director of TV commercials. Biz Petterelli is a child-actor-turned-magazine-writer who thrives on spontaneity. Though polar opposites, they are fully committed to their relationship and their life in Brooklyn with their dog, Matilda. They're also about to have a baby together. And they're freaking out. They've both dreamed of becoming parents, but now that it's happening, they're doubting everything. Their baby is due in a few weeks and instead of flying to California just before the birth as planned, Biz has a better idea. They could use one last hurrah, along with some serious "us-time" to mend the issues they've been having lately-before they get tied down by fatherhood and its impending responsibilities. So the daddies-to-be load up their 1992 Volkswagen Cabriolet and embark on an epic cross-country babymoon. They attempt to recharge at the beach in Provincetown, stumble through their impromptu baby shower in Chicago, and endure a Star Wars-themed wedding ...