Code List
During your run, enter the follow commands to first unlock the cheat codes:
UP, TRIANGLE, DOWN, X, LEFT, CIRCLE, RIGHT, SQUARE
A message saying "Cheats Unlocked" will flash on screen. This will last only for one race. You can then enter any of the following during your run:

Anti-Gravity: DOWN, TRIANGLE, SQUARE, SQUARE, UP
Super Bunny Hop: UP, X, LEFT, SQUARE, UP
Super Bounce: LEFT, SQUARE, X, UP, TRIANGLE
Mega Flip: RIGHT, UP, UP, RIGHT, RIGHT, SQUARE
Adrenaline Boost: DOWN, LEFT, LEFT, RIGHT
Combat Upgrade: UP, DOWN, LEFT, LEFT, RIGHT
Stoke Trick Meter: DOWN, LEFT, LEFT, RIGHT, RIGHT
Upgrade to Bottle: UP, DOWN, LEFT, LEFT, RIGHT, RIGHT
Energy Restore: DOWN, RIGHT, RIGHT, LEFT, LEFT
Always Stoked: DOWN, SQUARE, SQUARE, LEFT, CIRCLE
No Combat: LEFT, SQUARE, CIRCLE, SQUARE, LEFT
Extra Smack Time: LEFT, RIGHT, DOWN, DOWN
Infinite Bottles: UP, X, LEFT, LEFT, CIRCLE, CIRCLE
More $$$: RIGHT, UP, UP, CIRCLE, CIRCLE, SQUARE
Speed Freak: DOWN, TRIANGLE, RIGHT, RIGHT, SQUARE
Unlimited Energy: DOWN, TRIANGLE, LEFT, LEFT, SQUARE