Unlock All Levels:

Press Down, Left, Up, Right, Down, Left, Up, Right while the game is paused.

Unlock All Tricks:

Press Down, Left, Up, Right, Down, Left, Up, Left while the game is paused.

Level Select:

Press Circle, Up, Down, Square, Triangle while game is paused.

Huntington Level:

To unlock the 8th level, go to the big gray ramp with a blue streak on
the bottom in front of a wall. Go off the ramp, and do an air trick. If
you hit the wall in the middle of the trick, you will land it perfectly
and get full points.

Play as Master Ao:

Get all the photos, coins and keys in both wings of the dream house with any skater. Master Ao is the ultimate skater with full balance, vert, and street meters plus every single trick

Hints

The Dream House:

When you have opened the final skate area (Huntington) then place third or better in the completion to receive a dream house in which wings of the mansion can be unlocked by completing tasks from the courses (high scoring, hitting certain objects etc.).

Secret Character:

If you beat the photo shoot at Huntington with any of the regular characters then you will receive a special character.

Pictures:

After you gain the all the points for a photo shoot, you will see different pictures, like the drawings for the NYC area, and others.