All beaches
At the title screen hold L1 R1 and press Left Circle Up Down Circle Left Down Circle X to unlock all boards
Game Shark Codes
Master Code Must Be On ECB783B4 14243B64
Unlock All Beaches 4CAF0BDC 1456F00C
Unlock All Boards 1CAF0BF0 211FF0CC1CAF0BF4 211FF0CC1CAF0BF8 211FF0CC
Unlock All Challenges 4CAF0BFC 1456E09C
Unlock All Characters 4CAF0BE0 1456E00C
Unlock All Oufits 1CAF0BE4 114FE09C1CAF0BE8 114FE09C1CAF0BEC 114FE09C
High Score P1 1CAF06D4 14539735
Everything
All of these folowing cheats must be done at the screen where it says to press start
All beaches
Hold L1 and R1 and press down up left left down 0 0 right
All Surfers
Hold L1 and R1 and press left 0 up right 0 left left
All Surfboards
Hold L1 and R1 and press left 0 up down 0 left down 0 X
Unlock All Surfboards
To unlock all of the extra surfers in the game press and hold R1 and L1 at the title screen Then press LEFT CIRCLE UP RIGHT CIRCLE LEFT LEFT