At the main menu enter Y,B,X,Y, DOWN, RIGHT, UP, LEFT, L, L ,RIGHT, RIGHT, DOWN, UP, R, X, LEFT, B, B, DOWN.

Pause the game play in story mode,then press X, X, B, X, X, Y, X, X, L, R if done correctly when you unpause the game, a screen will pop up that you have completed all objectives. The rest of the time you have in the level is basically free skate.(The cheat does not effect scooter icons and players)

At the main menu press B, Y, X, B, L, X, R, L, X, R, B.