Beat Huntington in first, or second place. Then
you will unlock a photo shoot. As the loading
screen says get 8,000 points. When you have
succesfully done this, the screen will say you
have unlocked secret characters.
Play As Master Ao
Get all keys, photos, and coins in both wings of the dream house with any
character to unlock Master Ao, the ultimate skater (full vert, street, balance
meter, plus every trick).
To unlock level 8 (Huntington), go to the big gray ramp with a blue streak on the
bottom that is in front of a wall. Go off the ramp, and do an air trick (e.g.
Christ Air). If you hit the wall in the middle of the trick, you will land it
perfectly and get full points.