Unlock All Courses and Characters:
Goto the Sound Test Screen and play the "blink 182(dammit)" track.
Next select "blink 182(untitled)" and exit.
Finally, go to the characer selection screen and press and hold:
square+triangle+circle+x

Unlock All Courses:
Goto the main menu and quickly press the following:
right, left, right, left, circle, square, circle, square
Then choose any FreeRide Mode.


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Unlock Boards:
QUICKLY press the following buttons at the Main Menu. Then go to the Board Selection Screen and choose Pitbull. This will unlock the corresponding board below.

Steve:
right, left, right, left, square(x2), circle(x2)

Jimmy:
right, left, right, left, square, circle(x3)

Daniel:
right, left, right, left, circle, square(x2), circle

John:
right, left, right, left, circle, square(x3)

Big Air:
right, left, right, left, square(x3), circle

TD5:
right, left, right, left, square(x2), circle, square

Angel:
rght, left, right, left, square, circle, square, circle

Accolade:
right, left, right, left, square, circle(x2), square

Fire:
right, left, right, left, square, circle, square(x2)

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Race Against:
QUICKLY press the buttons(below) at the Main Menu and then in World Tour Mode, finish in first place on the first track. You will then be able to race against the selected racer below in the next race.

Race vs. Fabien Rohrer:
square(x5), circle, square, circle

Race vs. Mike Beallo:
square(x6), circle, circle

Race vs. Nicola Thost:
square(x7), circle

Race vs. Shawn Palmer:
square(x8) i.e. 8 times

Race vs. Ross Powers:
square(x5), circle, square, square

Race vs. Ian Spiro:
square(x6), circle, square