As for 13-15, which I promised to discuss earlier:
The 13th was not there when we started. In fact, it was about the only place on the property where Bill Coore seemed a bit stumped with his routing ... one version of his original 18-hole plan had a par-5 starting from this green and playing around to the 14th green on the Red course, but it didn't really work because you would drive down into the low area left of the tee.
What was different "before" is that the left side of the hole was the same elevation as the right, so that you couldn't see the lake to the left at all from the tee. Plus, if we'd left it, you could have driven your cart right up to a very dangerous bank, and wound up swimming with the alligators. So we cut sand out of the left side for three or four days, and took it to fill up the fairway on #12 Blue and the tees for #15 Red, both of which needed the sand. I thought it turned out pretty well considering what we started with.
On the 14th, we had to make more room for the tee shot by filling in the corner of the lake ... which turned out to be MUCH deeper in that spot than we'd anticipated. Originally there was a ridge between the 15th fairway and 14th fairway and then a bit of room and then a very steep bank down to the water ... by cutting that ridge away we got the fill we needed.
However, the above cut did change the look of the 15th from the tee and give fewer reference points on where to place the tee shot. Fifteen was a completely natural hole that Bill had found early on -- fairway and green contours are pretty much as they we found them, all we did was clear grass out of the blowouts. On top of that, to our surprise, after the hole was built a pond formed on the right side of the hole, and when it was drained the hole got even wider on that side than it had been, so that the "centerline" of the hole visually is further to the right than it used to be. I still prefer to aim left-center off the tee and stay up on top of the fairway to hit straight across the ridge short of the green, because that's how I always visualized the hole, but I'm not really sure if it's better to play it that way or to try and sneak down the right side.