Press C-UP during the intro and move the control pad around to have full camera control.
In Match race, beat the five courses on hard mode. This will unlock the Dragon Cave course.
In Match race, beat the six courses on expert mode. This will unlock the Deadly Fall course.
With any character clear the expert mode. Now on the character selection screen select Akari. Press C-Left and then A (you should be on the sceen that shows character technique, speed, balance, power and jump). If you've done it correctly you will see Akari's picture replaced with the Crystal Boarder at the track selection screen.
Win all time attack and trick attack modes with first place rankings. Now on the character selection screen highlight Rob. Press C-Right and then A (you should be on the sceen that shows character technique, speed, balance, power and jump). If you've done it correctly you will see Rob's picture replaced with the Panda Boarder at the track selection screen.
Win the expert mode with the Crystal boarder. Now on the character selection screen highlight Kensuke. Press C-Up, and then A (you should be on the sceen that shows character technique, speed, balance, power and jump). If you've done it correctly you will see Kensuke's picture replaced with the Metal boarder at the track selection screen.
In training mode perform all 24 tricks. Now, at the board selection screen highlight the Tahoe 151 board and press C-Down followed by A.
Here's a cool trick to easily clear all tricks in the Training Mode (so that you can get the Penguin Board). Go into the Training Mode with any character and do a couple of the simple tricks (so that they turn red in the trick list). Then, when you get to a trick you can't do, go to your trick list and pick a real easy trick (like a board grab). Do the easy trick and immediately press C-Left to go back into the trick list while you are still in the air. Now select the trick you can't do (like a 1080, for example) and go back into the game. Land your board and the game will think you actually did that trick.
To be able to snowboard past the finish line, you must be in a match race. You can do this with anybody on any course. Make your way down to the finish line. Before you pass the finish line, press start and go to retire. Now you will continue to snowboard past the finish line.
During the View Replay option for the Half Pipe mode you can add record scratches to the backround. To do this, move the control stick in any direction during the Half Pipe Replay. Note: This trick only works in the Half Pipe mode replay.
During the countdown of a race, right before you start (3-2-1), wait until the 1 disappears and press Up on the Control Stick. This will cause you to lunge forward and give you a much quicker start.
After crashing, press forward and give yourself a small thrust.