Hello all, I'm an Angeleno, visiting friends in the Bay Area next weekend (July 12-14). I'll be driving to the Napa Valley around 1 PM on Saturday the 13th and have a 4 PM reservation at Smith-Madrone, which is the latest reservation they offer. Is this doable? Will I have time for one other winery along the way? (I was thinking maybe Heitz since it's also in St. Helena & you don't need a res).