John B.
Yelp
This greenway trail seems like what I've been looking for. Lexington is notable for having a relative lack of urban sprawl, with zoning laws ensuring that much of the city is surrounded by rolling hills covered with farms. The outskirts of the city are very pretty to drive through, but you can't really do much as the farms are privately owned and there isn't much in the way of parks or trails. Enter this paved pathway, which runs from the city proper out to the horse center.
It seems geared towards bikers, which I am not, but there was certainly space for pedestrians and I saw a few others. I visited a section that ran by some university-owned test farms, and got a treat with nice views, ample songbirds, and peace and quiet. I did get mobbed by some sort of fly as it got dark; though it did not seem to be of any biting or stinging variety you definitely want to consider repellent, along with something for pollen allergies and some sunscreen. The entire length of the trail is farther than I could walk on one night, but I suspect it will be well worth exploring, as this is exactly the sort of thing Lexington needs.