Rode this park for the first time on Monday. Its a great park! One of my favorite so far, being that I am still pretty inexperienced and my fitness isn't so hot, this place is challenging enough without being ridiculous and climbs are moderate, but not like Allamuchy's cardiac.
I rode blue and a couple loops around red. I saw plenty of others out there riding, including a guy in full on mtbnj garb, so I guessed it was kosher to ride. It was however pretty muddy in many spots, but overall the trail was in pretty good shape.