Another great stop in Half Moon Bay is Old Princeton Landing. At least I think that's the name of the place.
This bar is one of a dying breed. It's a no-frills gin mill with a good beer selection and an unusual clientele. The regulars are a mix of sinfully rich techies, bikers and the occasional fisherman/woman.
There's a picture of Neil Young on the wall playing in a bar, which just happens to be the same bar.
Edited to remove Verizon's spam.