Depends on where your work is, what part of Nashville, TN. Looking on google maps, trying to spot nearby secluded/somewhat secluded areas, forest, parks... ect.. may be helpful.
Theres Radnor Lake state park, some grassy, perhaps secluded areas along Cumberland river, near shelby bottoms nature center & greenway, Bordeaux garden park, some more treeish area near Mount Olivet funeral home & cemetery, some more near Mill creek and Raymond heights.. it goes on.. never been there though so you'd need to suss em spots out, thats just a quick peep on google maps via satellite image.