A couple things.
Act like you are more of a backcountry skier, then they wont expect much.
Get good really fast, do your best to at least.
Dont pussy out on a jump, act excited if you do like a 50/50 on a huge box, and NEVER, ever go off the side of the lip of a rail.
I did this I just tried to not ever seem excited about doing something. I just was really focused on the trick.
Hope I helped it kinda sounded stupid. Good luck.