Coming down the Mid-Cape Highway (Rte.6) get off at Exit #6, Rte. 132. Stay on 132 for about a mile and take a right onto Bearse's Way. Take this into Hyannis to Main St. Turn right at the lights, go to the next set of lights and turn left onto Sea St. Go down Sea St. for about half mile; Oak Grove cemetery is on the left. Go thru to the back of this cemetery and Oak Neck is on the backside across OakNeck Rd.
You can also get to it off Old Colony Ave, about a mile down South St. You can see this intersection on this map.