I think you missed the actual Hanging Stone - it is located about 50 meters to the South-East of the rocky outcrop upon which the modern writing "Hanging Stones" is carved - this large stone forms part of the wall... I uploaded some pictures...
I dont know who carved the rock with the writing, or why they did this, but I think they got it wrong! :)
It was great, thanks Carl.
It is no further away than Orkney, 110 pound ferry crossing, 337 pounds for the apartment, just about affordable for most of us.
It is a stupendous place, if you like stones and I know that you do, this is the place. Still lots of places on my list I didn't get round to.