Meet at 11AM at Dublin/Pleasanton BART (a ways out there: about a 50-minute BART ride from 16th & Mission, for example).
Hitting up Ruby Hill Winery in Livermore first for a picnic (they sell bread and cheese) and tasting, about an 8 mile ride: http://www.rubyhillwinery.net/tastingroom.html
Next stops TBD.