Duartes can be difficult w/o a res on weekends and is a bit of a production. Though we love it. The San Gregorio general store is really neat but has very little in the way of food
In Pescadero though there are are two other options.
1) in the Gas Station catty corner to Duarte's is a decent tacqueria.
2) Down the street in one on the two markets is a wood fired pizzaria- haven't tried it yet but it was hoping the other day when I was there. Also they have barbeques outside there fairly regularly.
Pescadero it self is worth looking around.
In Half Moon Bay, I like San Benito House (sandwiches). Sushi Main Street and 3 Amigos (taqueria) isn't bad, nor is the airport cafe (3-0 cafe). There are a couple of fish-and-chips places in HMB as well, but i'll defer to others for recs on those.
Duartes and the taqueria/gas station in pescadero and the roadhouse in davenport are other options.