Ski, the back right pin on 10 is rough because it sits on a shelf in that corner, and the whole green tilts from back right to front left. There's almost no way to get an approach shot close because approach shots get pushed left and to the front of the green, away from that shelf. You can't really aim right of that flag because it's perilously close to the cart path, tree and road. Back left on 10 isn't easy, but you can get close to it by running it up the "ramp" on the front and letting the green's natural contours move the ball toward the left.
On 16, there are 4 distinct shelves. The front (bottom) area is not used for a pin...arguably, you could put a pin there, but it's a small area, and since many balls hit onto this green end up at the bottom anyway, I'm not sure it's the hardest. The second shelf is middle/right, and it's the birdie pin...it gives you a great backboard to use and it's not difficult. The third shelf is a little higher up, middle left. It's a bear...it's a small area, protected by a bunker in front and the road left, and it's very hard to get an approach shot to stay there. Putts to this shelf from other areas of the green are rough, and can result in balls rolling down to the front. No doubt about it, this is the pin that the members dread. Last area is the whole back third of the green, at the top. It's hard too, but at least it's a large area, relatively flat, that approach shots can receive.