These guys migrate here and stay for a few months. As time goes on, the upper part of the breast and neck start to darken. When it gets really dark, you know they're about to leave. This one looks quite young and has no darkening at all. Most other ones now are pretty dark so they won't be around for much longer.
Could be one of several Plovers. From your description, most likely the Pacific Golden-Plover. The field mark of note is the "yellow eyebrow". Great photo. Love the low angle.