Go to "Options" > "Cheats", then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CHEAT CODE All bonuses - 2468G0A7 Very fast acceleration - JIH345 All FMV sequences - 23F7IC5 All tracks - BA7H Maximum air - BFB0020 Left Field gear - 12345 Sobe gear - 50B3 Butterfinger gear - B77393 Sky camera - HIC Nokia trickbot - HA79000 Officer Dick - BADG3 Slipknot Maggot - 86657457 Speed Demon - 773H999
Enable the "JIH345" code, then play at the free ride area "Rock Quarry". When you start, do a 180 and go down the big ledge towards the container jump. Clear it, then hold it pinned. As you approach the excavator, jump and keep holding it pinned. Jump it as close to the wall as possible. When you are airborne, whip it to the right (towards the wall) and hold it. You should fly over the wall and into a glitch where everything turns white. You will fall for some time, then respawn on the ground with the game stating that you have jumped up to 1,000 feet (usually in the 900 feet range).
There is a river in Travis' compound. Jump it using the nearby ramp at low speed. Perform tricks and splash on the river. When you reappear, the tricks will still be there, ready to be counted. Do more tricks and land them. The extra tricks will be added to your previous ones.