I was raised in Sonoma County, in which Santa Rosa is located (my hometown is Healdsburg, about 15 miles to the north). I never visited the Bulgarian church (only the OCA, St. Seraphim), but the pictures on the website seem pretty standard. You will notice if you go there that there are many Eritreans and Ethiopians (there are a lot of Ethiopians and Eritreans in Sonoma County since about 15-20 years ago, but no Oriental churches for them, so you will find them in the local EO churches). Perhaps this explains the somewhat more conservative dress code? (They don't seem too strict to me, but my sense of this is probably warped since I go to a Coptic church where I am the only non-Egyptian besides two Ethiopians, and Copts and Ethiopians alike are both quite conservative.)
You should definitely, definitely (definitely!)
visit Fort Ross
while you are in the area! This is not just my nostalgia for home talking, it really is great. Even my non-Orthodox friends love it. I have a good friend who is an elementary school teacher who brought her class (third graders). and even they loved it. I think every Orthodox person should visit there.
(Can you tell I'm proud of it? Hehe. And I'm not even Russian or EO.)