Get off the gondola and take the lift on the right. Get off that lift and get onto the next one to the top. Keep right as you ride down and you'll come to it on your right. Can't miss it really. Think it's on the piste map anyway.
cheers again, had a look for the half pipe when I was there before christmas but no where to be seen and the top was closed so couldn't even look for the snow park.
if the top's closed go up either of the chairs on the far right that take you to the bottom of the plateu then its a couple of hundered yards up to your right