Thrasher: Skate and Destroy

Hold select from the time you load the game up until you get on to the level you want. Then go back to the start menu, go on to the options menu and change the config to 'B' and restart the same level. Tony
Hawk will appear on the character selection screen.

Extra points:
Pause and hold L1 + L2 + R1 + R2 then press Circle repetitively. Each time you press Circle your points will increase by 5,000. NOTE: this only works during a run.

Swimming pool fun:
On the court house level there should be a ramp with a fence in front of it. You can ollie off the ramp and over the fence. The swimming pool is over there. To get out just go on the other side and ollie off the ramp to get back to the level.