The Plan is to meet at the Walnut Creek BART station and to ride via North Gate to the Summit. Return to Walnut Creek BART via South Gate or vice a versa depending on input. If you are feeling it is too difficult you can wait at the North Gate South Gate junction and skip the summit. Suggestions on how to do lunch is welcome, the junction, the summit, Danville, Walnut Creek?. See the url below for the map.
There is an alternative off Southgate that is dirt. Maybe someone can explore it for a future route. See the end of Serafix Road in Danville.