More Boards:
An additional snowboard is unlocked each time your snowboard earns a new rank.

Alternate Costumes:
Successfully complete all green or blue square tricks to unlock two additional sets of costumes.

Running Man Mode:
Hold L1+L2+R1+R2 and press SQUARE, TRIANGLE, CIRCLE, X, SQUARE, TRIANGLE, CIRCLE, X at the options screen. repeat this code to disable it's effects.