My parents bought tickets for themselves and my wife and me for the US Open which will be held this June in San Francisco. We're going to be there Monday through Sunday and we're not set on staying in San Francisco for every day of the tournament. We're looking to venture out and see other things, including outside of SF. My wife and I have been to Napa but my parents haven't, so that's a consideration. Alternatively thinking about heading to Healdsburg. I'm interested in your recommendations for things to do in SF and around SF. Thanks, H_S.