The Bay Area is home to many great restaurants and food outlets, including excellent Thai cuisine. Since moving to Kansas City, I've been on the lookout for good Thai. I generally first try pad see ew (ผัดซีอิ๊ว), a noodle dish made with dark soy sauce, broccoli, egg, and tofu, setting a baseline for comparison. Thus far I'd say I'm partial to Spices, a restaurant whose strip mall location I stumbled across accompanying a friend to the iPhone repair store a couple of doors down.
Extra: Driving north along the California coast from San Diego to the Bay Area I stopped for lunch in Lompoc, a smallish city just outside Vandenberg Air Force Base. I had to the restaurant once before, having arrived in town late at night and finding the non-chain location near the hotel we had selected for the night. The restaurant is basic and limited to counter service but the food is tasty.