That's how I judged it, anyway.
As I was leaving, this lady was setting up her camera on a tripod and her husband and kids were obediently in line against a sea-oat fence. They were clearly related because of similarity in age and the more obvious fact that they all matched, clothing wise. A DIY family portrait session in progress. She was awkwardly fidgeting with the tripod and camera. Since I happened to walk by, I offerered, "Hey if you'd like to jump in there, I can take a shot for you with you all in the shot."
She sized me up. Bald - fat guy with a crappy looking camera. Boat shoes that have been repaired at the Shoe Hospotal too many times, walking alone on the beach with a camera. "Uhh, well, uhh.. I just gotta, you know.. get this setup and.. uhh... well, and ug..."
Yeah, she thought I was a creeper. That's how I suspect she judged it, anyway.
It reminds me of a lesson I learned in High School. It's really easy to walk around with a pissed off look on your face so that people leave you alone. It is work, on the otherhand, to commit random acts of kindness with strangers.