the rail that leads into the pond is real easy to do, there is a big hill in front of it. Just duck a few branches, dodge a few trunks and you will be set. There is also the buildings deck that you could jump off, but i think they are doing construction on it.
There are some shots in the beg and end of this edit which show the spots.
http://www.youtube.com/watch?v=RClXrVP6Nnk
It was interesting that when i went to do these the set ups had allready been built and there was a van parked in front of the quad kink preventingn ppl from sliding it.
there are some more spots in the park, but id love to hear from that guy who was scoping rails off the 33 and down at holimont