Where to get married near sfo

Hi,


My fiance and I are planning to get married in CA in the last week of May or April next year. We're from another country by the way and hence, do not know much about how it is to get married in the US. We're only expecting 35 to 50 guests and looking at a budget of just $12,000.00 (all-inclusive, outside of dress, photography, and band). We already have 1 somewhere in (or near) Napa which fits our budget, but we'd like to explore other options. We're going to make it simple. Good place, good food, good music, surrounded by our good friends and relatives is all we want for our wedding.
We'd love to have an outdoor ceremony and reception, preferably with a backdrop of vineyards, mountains, forest, or ranch. A drive of not more than 3 hours from the bay area where most of our relatives will be coming from is OK. A place where our guests would have something to do (maybe visit nearby attractions, play golf or whatever) before the wedding itself is ideal.
Just wondering if you could possibly have some recommendations for our venue? Soon to be wife is having a hard time looking for one. So here I am. Thanks in advance for your help.