Park at the Freshwater Bay trailhead. Follow the trail to the bay then along the west shore of the bay to an east coast trail sign that reads Ft. Amherst. (~40 minutes) Do not follow the sign, take the right fork in the trail, continuing along the shore of the bay until reaching a sign that reads Gunners Cove (~10 minutes). Hike along the coast past the first cove along flat rocks, until reaching a large flat boulder with a stream running underneath it. Walk up the stream until the giant boulder presents itself (~3 minutes).