There's another thread in here on this topic. I'm sure someone will link to it eventually.
There's a lot of Syrah produced around Santa Ynez, but it depends on what kind of Syrah you like. Do you like big, bomby Shiraz or more restrained Northern Rhone-style Syrah? Regardless, I think most Syrahs are pretty burly masculine wines here, but the cooler climate Syrahs tends to have better acid balance and aromatic complexity. For the latter style, Longoria Winery and Lafond Winery are very good at what they do.
More generally, Los Olivos and the Lompoc "wine ghetto" are great stops where you can visit several tasting rooms. Los Olivos features Longoria and The Bench (Syrah here as well), a tasting room for Santa Maria wineries Cambria, IO, Byron and Kinton, as well as excellent food options. Lompoc is more Pinot Noir oriented, particularly at Flying Goat and Fiddlehead, while Palmina produces amazing Italian-inspired wines.