Penguin board:

Getting the penguin board can be hard unless you know
this secret. Go through the trick list in training mode
until you get to one that you cannot do. Then pick an 
easy trick on the list. Do the easy trick and before 
you land switch to the trick list. Then choose the 
trick you cannot do and and switch back to your guy 
hanging in mid-air. Then just land the trick as normal
and it will count it as you doing the more difficult 
trick.

by Robe