My husband is a 4th Great-Grandson of Daniel Howe. We have gone to the Dublin VA area 2-3 times to try and see the house. We were given directions by a family member, but were told that the cemetery is not accessible to the public---we have taken pix of the gate leading to the house etc, and from the road you can see buildings in the distance. There is a NO TRESPASSING sign by the entrance to the long drive leading to the homes. I am sending you the directions we received a few years ago to find the location of Sunnyside--they follow:
"If you want to get to the vicinity of the cemetery, take Route 100 north out of Dublin, Pulaski County, VA, to Highland Road (about 4 to 5 miles north of Dublin), turn right on Highland Rd, go about one and 1/2 miles, and you will see two old stone pillars and a gate on the north/left side of the road. We have attached a photo of this gate and the view into the valley. Sunnyside was across the valley, along Back Creek. You will probably need a detailed map to find these roads."
If you are interested, I can send you copies of the photos we were able to take, from the road. It is possible that by now the road, and therefore the cemetery, is more accessible, but I don't know how to find out that information.
Anyway, hope this helps. Good luck!