Yeah, my comment isn't so much park related, but I tell my GF and all my buddies that get into riding to learn to live with falling because it's part of snowboarding. I wipeout everyday in the offpiste...
If you're not falling, you're not trying hard enough in my books. Then you're just a tourist.
Best thing to do when you fall, laugh at yourself.
Also, if I'm about to plunge off something that gets my heart rate up, I'll take a few deep breaths to oxygenate my blood. Calms me down and sets me up for the run/jump/chute/whatever.
I have to sit there and stare at my drop and plan it and plan it and think about it. Then once i have psyched my self up, I push my self off and commit to it. But what do I do? Wipe out and get stuck haha. So I regain my self, brush all of the powder out of my jacket, get out of there and come back for round two!