Various cheats
     Enter on the cheats codes screen in the extras section:

Cheat code:         Effect:
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