This is an area near Arcadia but not in it, full of boulders up to 20 feet tall, that is posted. However, it appears to be some sort of a land trust controlled by Fleet Bank with regularly used hiking trails. I am guessing that they post it for legal reasons, but don't really enforce it. I don't wish to encourage anybody breaking the law, but as long as I have known of the area, at least 15 years, I have never heard of anyone having issues. If you choose to visit, take responsibility for yourself in all ways, and be extremely discrete and low impact. It is imperative that you don't go as a large group, or with multiple cars, be very quiet and don't post up video on the internet. There are houses across the street, so don't do anything that would call attention to yourself and make them want to call the cops on you.
Located off Old Mountain Road/Trail (both names are used) between Carolina Nooseneck Rd and Hillsdale Rd. in the town of Richmond. Driving east from Carolina Nooseneck Rd, at the bottom of a curvy hill, there will be a gated pulloff into an old dirt road on your right. There is another gated pulloff further east, past Oak Hill Drive.