During gameplay press-up, triangle, down, X, left, O, right, square. 
You should see a message that says cheats unlocked.  Now you can
enter a code below:

Super Bounce

During game play press- left, square, X, up, triangle.

Super Bunny-hop

During game play press- up, X, left, square, up.

Anti-Gravity

During game play press- down, triangle, square, square, up.

Mega Flip

During game play press- right, up, up, right, right, square.

Combat Upgrade

During game play press- up, down, left, left, right.

Energy Restore

During game play press- down, right, right, left, left.

Adrenaline Boost

During game play press- down, left, , left, right.

Upgrade to Bottle

During game play press- up, down, left, left, right, right

Stoke Trick Meter

During game play press- down, left, left, right, right