I think part of the issue with my leg pain may have been under eating. I had a decent breakfast, a quick lunch just before the halfway point and a couple granola bars. Towards the end I was aching. Badly. I got home, had a banana, cleaned up and felt ok. 2 days later I've only had slight leg pain. I think I was trying to ride with no gas in the tank, and that I could have accomplished the ride much easier if I'd brought a little more to munch on. As sore as my legs were when I finished the ride, I expected to not be able to walk today. Not the case.
That said, I was in pretty decent shape before I started riding this summer and have done quite a bit of riding this Summer, even if it's shorter distances.