Julia darling,
At some point in the Summer of 1968, Grayson took time off to appear in one of our favorite films--End of the Road. It was not released until the winter of 1969-70 because the director was a film editor and he spent a year cutting and re-cutting it (and it still got an X rating). As you know, 2 of Grayson's scenes wound up on the cutting room floor. I'd personally rather see those scenes than the material that was cut from house of Dark Shadows, but both are probably gone with the wind in any event.
End of the Road was filmed in Great Barrington, MA. I'm not sure exactly where the beach scene was filmed. LOVE that scene.
Happy Summer Solstice (tomorrow!),
Steve