All Tracks, Boards, and Characters Code
To start with all the extra mountains, boards, and the hidden character, input the following code at the "start" screen (where you can select start, lesson, or option): Analog Stick Down, Analog Stick Up, D-pad Down, D-pad Up, C-Down, C-Up, L, R, Z, D-pad Left, C-right, Analog Stick Up, B, D-pad Right, C-Left, and last press Start. If done correctly you'll hear a kid saying "Yeah!"
Blue Star Trick
To perform a trick with blue stars instead of golden stars, do this trick off a jump. Hold A, tap the control left first then right and release A at the jump. This will make your character do a 720 grab.