Eastern Indigo Snake (Drymarchon couperi)
The individual that we found looked to be over 6.5' long, and almost as thick around as my forearm. It was basking near this Gopher Tortoise (Gopherus polyphemus) burrow.
At first glance, this snake looks to be simply a large, shiny black snake, but it has some beautiful iridescence in the black, as well as some neat reddish tones around the face.
Here's a close-up of part of the snake where you can see the individual scales and the skin between them.
This snake had probably shed very recently, and had such clear eyes. If you zoom in on this photo you can see trees, sky, and the sun reflected in them.