On the ice, IF our Extremly carefull, you can wheelie up to the point where the rider is almost about to fall off, then left go of te all the buttons, the bike will begin to float like a tree across the Ice, then, you can pull a stunt, press forward on h joystick and land it. It's dificult.
By the way, I've never seen this trick posted on any site before, Imigh be the first..I dunno....