Open Gates:
To unlock all gates beat Street Tour mode with all four regular characters.

Extra Boards:
To unlock all skateboards beat Street Tour mode with all four bonus characters.

Reversed Courses:
to have day and night course selection and skate any of the courses in the opposite direction you
must beat "Street Tour" mode twice with all four bonus characters .

Play as Sarah:
Beat Street Tour mode twice while playing with T.J.

Play as Mick:
Beat "Street Tour" mode twice while playing with Jerry.

Play as Bonobo:
to unlock the monkey Bonobo, beat "Street Tour" mode twice while playing with Ginger.

                             Game Shark Codes

     Unlock Bonus Characters - 80094138 FFFF 
     Unlock All Levels - 80094230 3F00 
     Extra Points - 8007B19C 8800