Get the secret level named Venice Beach
Skate over to the freeway overpass and locate the tiki shop. Ollie into the mouth of the smoking tiki doll on the sidewalk to be transported into a mystical lava tube. Skate down the tube, then ollie at the edge to try to pluck the Old Skool Icon out of the air. It may take a few tries to grab the icon, but the Venice Beach course from Tony Hawk's Pro Skater 2 becomes playable once you get it.
More tricks, tips and cheats for this game are right here - Tony Hawk's Underground cheats
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