At the main menu, select "Options", "Cheats", then enter one of the following case-sensitive codes to activate the corresponding cheat function:

All specials - Enter "LOTSOFTRICKS" as a code to unlock all specials.
All decks - Enter "LETSGOSKATE" as a code to unlock all decks.
All movies - Enter "WATCHTHIS" as a code to unlock all movies.
All fun items - Enter "OVERTHETOP" as a code to unlock all fun items.
All create-a-skater items - Enter "GIVEMESTUFF" as a code to unlock all create-a-skater items.
All Lounge bling items - Enter "SWEETSTUFF" as a code to unlock all Lounge bling items.
All Lounge themes - Enter "LAIDBACKLOUNGE" as a code to unlock all Lounge themes.
All rigger pieces - Enter "IMGONNABUILD" as a code to unlock all rigger pieces.
All video editor effects - Enter "TRIPPY" as a code to unlock all video editor effects.
All video editor overlays - Enter "PUTEMONTOP" as a code to unlock all video editor overlays.

FDR level - Enter "THEPREZPARK" as a code to unlock the FDR level.

Lansdowne level - Enter "THELOCALPARK" as a code to unlock the Lansdowne level.

Air And Space Museum level - Enter "THEINDOORPARK" as a code to unlock the Air And Space Museum level.

Play as Boneman - Enter "CRAZYBONEMAN" as a code to unlock Boneman.
Play as Bosco - Enter "MOREMILK" as a code to unlock Bosco.

Play as Cam - Enter "NOTACAMERA" as a code to unlock Cam.
Play as Cooper - Enter "THECOOP" as a code to unlock Cooper.

Play as Eddie X - Enter "SKETCHY" as a code to unlock Eddie X.
Play as El Patinador - Enter "PILEDRIVER" as a code to unlock El Patinador.
Play as Eric - Enter "FLYAWAY" as a code to unlock Eric.

Play as Judy Nails - Enter "LOVEROCKNROLL" as a code to unlock Judy Nails.

Play as Mad Dog - Enter "RABBIES" as a code to unlock Mad Dog.
Play as MCA - Enter "INTERGALACTIC" as a code to unlock MCA.
Play as Mel - Enter "NOTADUDE" as a code to unlock Mel.

Play as Rube - Enter "LOOKSSMELLY" as a code to unlock Rube.

Play as Shayne - Enter "MOVERS" as a code to unlock Shayne.
Play as Spence - Enter "DAPPER" as a code to unlock Spence.

Play as TV Producer - Enter "SHAKER" as a code to unlock TV Producer.

Full stats - Enter "BEEFEDUP" as a code.
50 extra skill points - Enter "NEEDSHELP" as a code. Note: This code may be repeated as many times as desired.

Perfect manual - Enter "STILLAINTFALLIN" as a code.
Perfect rail - Enter "AINTFALLIN" as a code.

Infinite focus - Enter "MYOPIC" as a code.
Infinite slash grind - Enter "SUPERSLASHIN" as a code.

No bails - Enter "ANDAINTFALLIN" as a code.

Super check - Enter "BOOYAH" as a code.
100% branch completion - Enter "FOREVERNAILED" as a code.

Invisible man - Enter "THEMISSING" as a code. Note: This code cannot be used with the video editor.

Mini skater - Enter "TINYTATER" as a code. Note: This code cannot be used with the video editor.

No board - Enter "MAGICMAN" as a code. Note: This code cannot be used with the video editor.

Bonus characters - Get an "AM" rank or higher in all missions of the listed challenge type to unlock the corresponding character:

El Patinador: Rigger challenge missions
Judy Nails from Guitar Hero: Career challenge missions
MCA from the Beastie Boys: Hardcore challenge missions