Help me identify a bird.?

I have never seen one like this before. It looks like it could be a shore bird, although I see it at our community 3-hole golf course greens, about 3 miles from the Pacific in central California It is slim, has long legs like a shore bird, looks a lot like and is the size of a plover. Except it has a long white neck with a narrow black ring in the middle. And has a yellow beak. The back, wings and head are grey, the underside is off-white. It seems used to people and walks slowly along the short grass seeking grubs. I have only seen it for a week and have not seen it in flight.

I have searched my bird books and googled but see nothing just like it.