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Course Hints Mode

At the Options screen, hold down L1 + L2 + R1 + R2. Then enter the following sequence: Square, Triangle, Circle, X, Square, Triangle, Circle, X. Repeat this to disable hints.

Magic Board

Hold R1 + R2 + L1 + L2 and press X four times, then Triangle four times.

Master Code

This is the code to unlock everything (all courses, boards, characters, and outfits).
Press Square at the main menu to get to the options menu. Then, hold down all theshoulder buttons (L1 + L2 + R1 + R2) and press DOWN, LEFT, UP, RIGHT, X, CIRCLE, TRIANGLE, SQUARE. A beeping sound will confirm the code.
Redo the code to disable it.

Max Stats

Enter this code at the Options Menu. Hold all four shoulder buttons (L1, L2, R1, R2) and enter in the following code:
X, X, X, X, X, X, X, SQUARE. If you entered the code correctly, you will hear a tone.

Running Man Cheat

At the Options Menu press and hold all four shoulder buttons (L1, L2, R1, R2) and enter in the following code: SQUARE, TRIANGLE, CIRCLE, X, SQUARE, TRIANGLE, CIRCLE, X. You should hear a tone if you entered the code correctly.

Unlock Extra Costumes

Unlock the other costumes by performing all of the various colored tricks.
Third costume: Complete all green circle tricks to unlock this costume.
Fourth costume: Complete all blue square tricks to unlock this costume.

Unlock Hidden Characters

To unlock hidden characters, you need to win gold medals:
Win 1 Gold Medal to unlock Jurgen
Win 2 Gold Medals to unlock JP
Win 3 Gold Medals to unlock Zoe
Win 4 Gold Medals to unlock Hiro

Unlock Hidden Tracks

Beating all of the races in the World Circuit will open the Aloha Ice Jam. This course is located on an iceberg in Hawaii.
Beating all of the showoff events will open the Pipedream course.
Beating the Aloha and the showoff event on the Pipedream course will open the last course called Untracked. This course is a freeride down the side of a mountain.

Unlock New Boards

As you increase in rank, you will unlock new boards to play with.

Achieve the rank of Rookie to unlock the third board.
Achieve the rank of Sensei to unlock the fourth board.
Achieve the rank of Contender to unlock the fifth board.
Achieve the rank of Natural to unlock the sixth board.
Achieve the rank of Star to unlock the seventh board.
Achieve the rank of Veteran to unlock the eighth board.
Achieve the rank of Champ to unlock the ninth board.
Achieve the rank of SuperStar to unlock the tenth board.
Achieve the rank of Master to unlock the eleventh board.