Wel, it depends on how much snow you got, in our case it did fuck with our bases, so take old skies if you got them =) And it depends on how your skatepark is build, but we had some trouble with getting speed, ended up with letting a parent of one of the little kids tow us by car =P
Here is a little edit of some snowboard friends of mine, skatepark starts around 2.15
http://www.youtube.com/watch?v=wR546bDPDAg
Hmz, hope it works