Without a Paddle (2004)
Without a Paddle is a 2004 comedy film about three reunited childhood friends going on a trip up a remote river in order to search for the loot of a long-lost airplane hijacker. The film stars Seth Green, Matthew Lillard, Dax Shepard, Ethan Suplee, Abraham Benrubi, Rachel Blanchard, and Burt Reynolds.
More at Wikipedia.