I have been going to Cape Cod for over 20 years now. My love for Cape Cod started with a summer camp I went to when I was a kid. Everything was (and still is) completely different there from the people to the photogenic landscapes.
Every town offers something new to shoot from the sand dunes in Provincetown to the sunset in Woods Hole. I couldn't recommend Cape Cod any more for a family vacation just make sure your camera is always at your side, ready to go!