Big air board

at the main menu, quickly press right, left, right, left, square(3), circle. then at the board selection screen, choose the pit bull curt man
 

Say No to Analog

With tricks, the Dpad is more accurate than the analog sticks

Don't hold X...

Unlike SSX or 1080 and other popular snowboarding games, holding X doesn't effect how height or length of jump so don't bother holding it down.