Anytime is a lovely time to go to the beach. The Cape is not the beach. My preference: September, early morning if possible. Yeah, a sweater is likely accoutrement, but equally likely to be shed. You find parking. You do not find traffic. You find more than a patch of sand to claim. You may even find yourself Commander in Beach, with only a spattering of fellow bipeds about, free to do silly things as one pleases.