So many uninformed and uneducated answers is this thread. As always on Newschoolers.
You have picked the right year to go to Jay's parks, they have just redone their whole parks system this year in an effort to be a bit more... modern. There are two main parks: the 360 park (medium) on the Tram side and the 720 park (big) on the State side. Jumps are really good.
It's quite funny actually. I hardly ski in the terrain park at all but, contrary to popular misconception, LOVE jay's park and actually ski park more there than anywhere else. The reason is: you take the tram/chair up, ski the chutes and the trees. The parks are localed perfectly right before the lifts on the flat. You go up, ski the trees, hit the mini park before getting on the chair. love it