I remember when I was younger and we would go to the far sides of Granite to get away from the crowds, college kids would always drive to the top of Granite on the backside, where the state park is, and park and then just hike down to where the runs start and ride down.
I would do it today, if my parents didnt buy me passes there (my dad gets them discount for some reason.... :O ) just because you can bet that none of their money is going to the park.
It also would be easy to get away with, ie: I keep my pass inside my coat cuff, and there has probably been one time all last winter where someone asked to see it.  The first time I skied out west, at Big Sky, I was shocked at how they had to scan everyones pass, every single time through...