Toobin'

The player competes in a river race against the computer or another player. The player's score increases by swishing the gates, hitting other characters with cans, collecting hidden letters to spell Toobin', and collecting treasures. Players try to avoid obstacles while pushing each other into them.
Power-ups allow players to carry multiple cans and combinations of gates increase a score multiplier.

The game has three different classes, each with five rivers, for a total of 15. The rivers in each class are as follows:

1. Colorado, Amazon, Okeefenokee, American and Nile
2. Yukon, Argentum, Left Bank, Cuprum and Canals Of Mars
3. Jurassic, Black Forest, Rio Grande, Styx and Nightmare

Source: Wikipedia, Toobin' , available under the CC-BY-SA License.