Nashville is a wonderful area. It's very spread out and usually takes 15-20 minutes to get most places. There are lovely parks, great food, friendly people and plenty to do there. There are tons of things to do in the downtown area with museums, restaurants and the Nashville Predators (hockey) and Tennessee Titans (football) playing in the neighborhood. There are several colleges in town, so there are tons of college games all yr round too. There are lots of different activities and the nice weather lasts longer so kids play outside a lot longer in the year compared to the Midwest.
I went to college in Nashville and heading back tomorrow to visit for the weekend. My son was 2 when we moved, but we loved visiting Centennial Park near Vanderbilt to enjoy the flowers and to feed the ducks.