Surf's Up Cheats - GameCube

Cheat Mode
Enter on the cheats codes screen in the extras section:

NICEPLACE - Unlocks All Art Galleries
MYPRECIOUS - Unlocks All Boards
GOINGDOWN - Unlocks All Leaf-Sliding Locations
MULTIPASS - Unlocks All Multiplayer Levels
FREEVISIT - Unlocks All the Locales
WATCHAMOVIE - Unlocks All Video Gallaries
TINYBUTSTRONG - Unlocks Arnold
ASTRAL - Unlocks Astral's Board
DONTFALL - Unlocks Bonus Missions
TOPFASHION - Unlocks Character Custimization
SUPRISEGUEST - Unlocks Elliot
SLOWANDSTEADY - Unlocks Geek
MONSOON - Unlocks Monsoon Board
IMTHEBEST - Unlocks Tank Evans
KOBAYASHI - Unlocks Tatsuhi Kobayashi
TINYSHOCKWAVE - Unlocks Tiny Shockwave Board
THELEGEND - Unlocks Zeke Topanga

Unlock Characters
Arnold - Obtain 30,000 points in Shiverpool 2.
Big Z - Obtain 100,000 points in Legendary Wave.
Elliot - Obtain 40,000 points in Pen Gu North 3.
Geek - Obtain 60,000 points in Pen Gu South 4.
Tank - Obtain 40,000 points in the Boneyards.
Tatsuhi - Obtain 15,000 points in Pen Gu South 2.