Book your visit to tour the inside of the house ahead of time! The week before the trip it looked like there would be plenty of spots available, but when we got there they were fully booked. Even so, we did pay to see the grounds -- which turned out to be every bit as satisfying - we could walk around the outside for pictures, see into the living room and other parts of the home, and talk with the grounds staff about the history of the place.
Well worth a day trip from Pittsburgh, but we were passing through on our way home to Michigan from Washington DC and chose to stay overnight at the Smith House Inn 25 minutes away. All in all, it was a wonderful experience and a great way to break up the trek home!.