Enter the following case-sensitive codes at the Cheats menu at the options

screen:

Roadtrip		Unlock Everything 
Backdoor		Unlock All Cheats Pause game for cheats menu 
Peepshow		Unlock All Movies Movies in Options menu 
Yohomies		Unlock All Skaters Including 8 hidden skaters 
WeEatDirt		Unlock All CAS 
GiveMeSomeWood		Unlock All Decks Current skater only 
PumpMeUp		Max your stats 
idkfa			Unlock Doom Guy + Gearbox Vid 

Created skaters:

Enter the following names at the create a skater screen.

Aaron Skillman (also by entering Aaron, Skillman, or ARS) 
Alan Flores 
Andrew Rausch (also by entering Jujy) 
Andy Nelson 
Brian Jennings (also by entering BDJ or Brian) 
Captain Jennings (also by entering Cap'n Jennings or Capn Jennings) 
Chad Findley (also by entering Stallion or Doofus) 
Chris Glenn 
Chris Rausch (also by entering Team Chicken, CJR, or Rausch) 
Chris Ward 
Connor Jewett 
Darren Thorne (also by entering Darren or Thorne) 
Dave Cowling 
Dave Stohl 
Edwin Fong (also by entering Maya's Daddy) 
Gary Jesdanun (also by entering Garvin or Garvin Jesdanun) 
Henry Ji 
James Rausch (also by entering My Jamie) 
Jason Uyeda 
Jeremy Anderson 
Joel Jewett 
Johnny Ow 
Junki Saita (also by entering Kage) 
Kevin Mulhall (also by entering Guilt Ladle) 
Lisa Davies 
Mark Scott (also by entering Hi Ben) 
Matthew Day 
Mick West 
Mike Ward 
Nicole Willick 
Noel Hines (also by entering Noel or Hines) 
Nolan Nelson 
Paul Robinson 
Pete Day 
Rachael Day 
Ralph D'Amato 
Ryan McMahon 
Sandy Jewett 
Scott Pease (or by entering Scott Pease, Spease, or Cheesy Peasey) 
Steve Ganem 
Steven Rausch (or by entering Wevenowski) 
Trey Smith 
William Pease (or by entering Wild Bill) 

Riley Hawk
Spencer Hawk
062287 
80's Mark 
Braineaters 
Crashcart 
DDT 
Eastside 
Frogham 
GMIAB 
Gorilla 
Grass Patch 
Mini Joel 
Pimpin Frank 
Rastapopolous 
Skillzilla (or by entering Gi Skillz)

Thanks to Revolution readers JUKE, EvilTree58, eXecrabLe, Robert P, and |<rYpT!