When you go of any jump (Kicker,
Superpipe, Cliff), hold L + White and press Left
Analog-stick Left and a colored "X" will appear. This
indicates that you have executed the commands
correctly. At the side of the screen where it tells
you what tricks you have done, "Special Bonus" will
appear at the bottom. That special bonus will boost
your score. You also can hold the correct buttons and
keep pressing Left. If you end up near a grinding
rail, hold Y. When you finish the grind, your score
will easily be 3,000 points.