There's an unlockable skate park in the game called Danny Way's Mega Park. To unlock it, you must advance through all video and photo shoots that are relevant to achieving full sponsorship. Full sponsorship entails board, truck, and wheel sponsorship.

After you achieve full sponsorship status, you will receive an invitation to Danny Way's Mega Park. You'll need to compete there - and win - in order for it to be fully unlocked to use at any time.