Hold L+R+Z and use the following codes to unlock sites:
The Warehouse: A,A,Y,A,Y
Grimeville: Y,Y,Y,A,Y N.O.R.E
Club Luda: X,B,Y,A,Y LUDACRIS
The Dragon house: B,A,Y,A,X
The Junkyard: A,Y,Y,A,B DMX
Def Jam: X,A,Y,A,B
Defjam Vendetts: B,X,A,Y,Y D-MOB
The Bounty Club: A,Y,Y,X,X YOUR CLUB DAWG