Replying to Free Skiing

Im going to whistler this weekend for a day and i really dont want to pay those rediculous day pass prices because i don't have alot of money to ski with. So my question to u is it doable to borrow a buddy of mines seasons pass and just use that or will they like look at the picture and shit or do something else to find out im not actually him. Also do u guys know what kind of shit i can get into for using somebody elses pass, like trespassing fines and stuff?