A water tower embossed with a large blue U and K appears over the treetops of the University of Kentucky campus near Kroger Field on Alumni Drive. Beneath it are 100 acres known officially as the Arboretum State Botanical Garden of Kentucky. After lacing our way up the entrance, we back into a parking spot so we can survey the setting. Even though my husband and I arrive before 8 a.m., the parking lot is filling with cars. Since we are there so early to walk, we assume the others are there for the exercise, too. Tentatively, we head toward a knot where the paths appear to twist together and then stretch out into various directions. As it appears there is no right or wrong way to travel, we randomly select one. As we head out on this paved path to explore the grounds, I secretly hope it returns to the general area of our vehicle before the sun sets at the end of the day. Or, at least before lunchtime. As we walk, we pass many others who are out running or walking. One couple is walking a dog. Or rather, a dog is dragging a couple along the path with it. One couple is walking two dogs. Another is jogging while pushing a toddler in a stroller. Some individuals are just out on their...