Max Goof, a typical teenager, finds himself grappling with feelings for his classmate Roxanne while also idolizing the pop star Powerline. His relationship with his quirky father, Goofy, is strained, as Max worries he may inherit his father's famously awkward demeanor. As the school year wraps up, Max teams up with his friends, P.J. and Bobby, to steal the spotlight during a school assembly by performing an enthusiastic lip-sync to a Powerline song. This bold act elevates Max to local fame, prompting him to invite Roxanne to a viewing party for Powerline's much-anticipated concert.
Meanwhile, Principal Mazur delivers a stern warning to Goofy regarding Max's disruptive behavior. In response, Goofy decides to take Max on a spontaneous fishing trip to Lake Destiny, Idaho. Struggling to reveal the truth about their plans to Roxanne, Max fabricates a story claiming that they are off to Los Angeles for Powerline's concert, where they supposedly received an invitation to party on stage with the star.
Their journey begins with an amusing stop at a shabby possum-themed amusement park, where Max feels the pangs of embarrassment due to Goofy's antics. The following day, they unexpectedly meet P.J. and his father, Pete, during a camping trip, which adds to the awkwardness. Goofy tries to connect with his son by demonstrating the "Perfect Cast" fishing technique, which humorously backfires when it attracts Bigfoot to their campsite, resulting in a restless night in the car while the creature prowls outside. Meanwhile, Max quietly adjusts their planned route to Los Angeles.
The next day, Goofy lets Max take over navigation, and they share some memorable stops along the way. However, that evening, Pete overhears Max’s conversation with P.J. and informs Goofy of his son's misleading narrative. Although Goofy is frustrated, he remains optimistic about Max doing the right thing. However, upon discovering Max's intentions to reach California, a disheartened Goofy chooses to abandon their trip at the Grand Canyon. In a twist of fate, a mechanical error causes their car to roll off a cliff, leading both of them to chase it and eventually tumble down the Colorado River. After a heated exchange, Goofy reassures Max of his unwavering love, promising that he will always be his son. With this newfound realization, Goofy resolves to take Max to the concert, where Max employs the "Perfect Cast" technique once more to prevent a disaster as they teeter over a waterfall.
As daylight fades, Max (voiced by Jason Marsden) and his eccentric father Goofy (voiced by Bill Farmer) stealthily sneak onto the stage at the concert, joining in Powerline’s (voiced by Jim Cummings) exuberant dance party, much to the delight of Roxanne, who watches in awe. The absurdity of the moment lights her eyes, and their adventure leads to a dash for home in their less-than-reliable vehicle.
Upon returning home, Max seizes a moment to confess to Roxanne about his escapades. To his surprise, she reveals that she has harbored feelings for him, too, setting off a flurry of date plans and excited anticipation. But just as life seems perfect, an unexpected explosion sends Goofy crashing through the roof onto Roxanne's living room floor. As Max stands by proudly, introducing his father to his new girlfriend, it's clear that their whimsical journey is far from over, full of unpredictability and laughter as they continue to navigate their offbeat lives together.
