Become Invincible
To become invincible, go to the Cheats screen and enter this code: KHUFU.
Bonus character:
Successfully complete the normal and hidden challenges in a level to unlock a bonus character. The characters are as follows:

Movie Lot: The Bride
Civic Center: Goddess
Industrial: Junkie
Boardwalk: Captain
Cannery: Diver
Airfield: Bombshell
Museum: Mummy
Cheats:
Collect all juice boxes in a level to reveal a cheat code.
Do Perfect Grinds
To do perfect grinds, go to the Cheats screen and enter this code: BIGUPYASELF.
Do Perfect Handplants
To do perfect handplants, go to the Cheats screen and enter this code: JUSTINBAILEY.
Do Perfect Manuals
To do perfect manuals, enter this code at the Cheats screen: QUEZDONTSLEEP.
FMV sequences:
Successfully complete the normal challenges in a level to unlock its FMV sequence.
Have All Keys
To have all keys, enter this code at the Cheats screen: SKELETON.
Keep Your Juice Bar Full
To always keep your juice bar full, go to the Cheats screen and enter this code: BAKABAKA.
Level Love
To unlock all levels, park editor objects, and get full stats, enter this code: UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, BABA.
More cheats
Enter the following codes as cheats. Directions such as LEFT and RIGHT refer to the arrows you can enter.

Level select, all park editor objects, full stats - UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, B, A
All bonus characters - DOWN, RIGHT, RIGHT, DOWN, LEFT, DOWN, LEFT, DOWN, RIGHT, RIGHT, RIGHT
Low gravity wallride - UP, DOWN, UP, DOWN, LEFT, RIGHT, LEFT, RIGHT, A, B, A, B, S
Juice regeneration - LEFT, LEFT, RIGHT, RIGHT, LEFT, RIGHT, DOWN, UP, UP, DOWN, A
Juice bar is always full - B, A, K, A, B, A, K, A
Juice remains after crashes - K, H, U, F, U
Power Skates:
Complete all challenges (normal and hidden) hidden on every the level. The Power Skates give you one blue stat point for every attribute.
Super Spin
To enable super spin, go to the Cheats screen and enter this code: LEFT, LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, RIGHT, LEFT, RIGHT, LEFT, RIGHT, UP.
Ultra Skates:
Complete all the levels with 100%. The Ultra Skates give you the other blue stat point for every attribute.
Unlock All Characters
To unlock all characters, go to the Cheats screen in the Options menu. Then enter this code (Directions refer to the arrows on the bottom row): DOWN, RIGHT, RIGHT, DOWN, LEFT, DOWN, LEFT, DOWN, RIGHT, RIGHT, RIGHT.
Unlock Cheat Mode
To unlock Cheat Mode, go to the Cheats screen and enter this password: PLZDOME.