Apologies for joining this discussion so late.
I was very lucky to be invited to play BGC this fall, and I wanted to point out a few things that I did not see mentioned in this thread.
#5 - I agree with everything Jon says about the hole, but I think he understates the brilliance of the hole and the options it presents.
What are the options? At 317 yards and uphill, there would seem to be little to gain from hitting a driver: you'll have a wedge left into the green even if you hit a fairway wood, and the angle of attack only gets harder the closer you get to the green. As the aerial below shows, the green--only ten yards wide--is not oriented toward the part of the fairway where most players will be approaching from, but instead toward the wide part of the fairway something like 140 yards from the green. What's wrong with a 140-yard approach? It's probably 20 feet uphill and completely blind. Even with an approach of 120 (if I remember correctly), mine was completely blind. So, given the steep climb the hole makes from tee to green, you'll probably need to make a 230- or 240-yard swing to get onto flat ground and give yourself a clear view of the green.
Hit a driver, and leave yourself with a half-wedge, no trouble in front, and no visibility issues. But miss long, and you're dead. Both of my playing partners ended up in that back bunker with obstructed backswings, and each made a 7. One told me later that a former tour pro calls it the shortest par 5 in New England.
#11 - I was told that the dead tree behind the green was petrified. I'm not sure how that's possible or whether that's exactly right, but it sure is a striking color.
#12 - Notice how the green is set on a saddle: sloping down from both the left and right sides toward the center, but with a false front and also a false back.
#13 - My caddie told me that the stone ruin on the inside corner of the dogleg used to be a holding pen for lost-and-found cattle (evidently it had a wooden gate at one point).
All in all, a great place to play golf.