Up the Creek (1984)

Synopsis
In this inane teen comedy, a rafting competition is going to determine whether four friends will graduate or not (an interesting amendment to college practices), and up against their team is a group of offensive rich kids. Meanwhile, a band of expelled military rafters is out to thwart the race as a whole. Bob (Tim Matheson) of the aspiring group of graduates, and Heather (Jennifer Runyon), a convert from the military rafting side, are a hot item, as are many other couples, since sex seems to be the only known activity carried out on land. A game of charades with a dog -- in order to locate a hostage -- is the funniest sequence in an otherwise routine story. ~ Eleanor Mannikka, All Movie Guide