You gotta do Jim Thorpe, PA in the Pocono Mountains. It's supposedly some of the best trails on the east coast. I have only heard great things about it. The main trail in the area is called the American Standard. I want to go up for a long weekend this summer my self to hit the trails up. You should try and go to Mountain Bike Week this summer. I forget when it is exactly but do a search for it on this board I know there was something about it on here.