Consider a visit to Spruce Forest Artist Village (for craftsmen), Frank Lloyd Wright's Falling Water (for architecture), or the Wisp's Mountain Coaster (for adrenaline junkies).
September is also a great month to see Garrett County outdoors. Swallow Falls, Herrington Manor, Deep Creek Lake and New Germany State Parks are all within reach and offer a range of hiking, biking, and paddling options.
For food, Brenda's Pizzeria (lunch/dinner), the Rolling Pin Bakery (breakfast/lunch), and Root Cafe (breakfast/lunch) are all great options.