Hi Paul
Some feedback for you in the meantime.
My wife and I were in the area today, went to deliver something to Calderwood Hall and visit a friend in Boston.
Apparently on the road from Boston towards Dargle (where Tanglewood hotel is located) is where the hotel you are looking for was located. It was demolished some time ago and nothing exists there to see today.
I was given the name of a lady to contact whose family were one of the first to settle in the area and hopefully she will have some more details.
If you go to 29deg 40'46.15"S and 30deg 01' 18.62"E on Google Earth that is the dirt road where the hotel was located. I don't know how far along that road, hopefully we can find out for you. About a screen width to the right of the intersection of the main road and the dirt road is the village of Boston (petrol station, trading store, farmers hall, moth shellhole, grave yard and probably a church and that is it). I have never been more than a couple of kilometers up that dirt road but it heads in the direction of Impendle. A few years back there was an offroad motorcycle race out there and the riders went up a rocky road that the original settlers there had cut into a mountain/hill side a couple of 100 years back. The bikes struggled getting up there so the old ox wagons must have really battled.
Glenn