Extra points:

Press Start to pause the game, then press Triangle, Square, L1, Circle, R1, X, R1, X. You will now have 9,100,000 lift points which unlocks all lifts except for the Moon Gate. You will also have 9,100,000 equipment points, which unlocks all boards, accessories, and special tricks.

All boarders:

Press Start to pause the game, then press Triangle, Square, L1, Circle, R1, X, R1, Triangle.

Challenges completed:

Press Start to pause the game, then press Triangle, Square, L1, Circle, R1, X, R1, Square. All challenges except for 43 (Race The Chief), 48 (Bomb #5), 49 (Alien Half Pipe), and 50 (Storm HQ) will be completed. You will also have all Bomb Pieces, with the exception of #5.

Alien unlocked:

Press Start to pause the game, then press Triangle, Square, L1, Circle, R1, X, R1, X. Challenges 43 (Race The Chief), 48 (Bomb #5), 49 (Alien Half Pipe), and 50 (Storm HQ) will be completed. You will also have Bomb Piece #5.

Shoot projectile:

Press Start to pause the game, then press Square, Circle, Triangle, R1. Press R2 to shoot a barrel with a projectile.

Slow motion:

Press Start to pause the game, then press Square, Circle, Triangle, L1. Press L1 + R1 when in the air or during a railslide to activate slow-mo mode. This mode automatically ends when you reach the ground.