During a recent wander around north of the Bay Area, we stumbled onto the "smallest bike shop in Sonoma County":
https://www.flickr.com/photos/33786397@N03/sets/72157652851030281/with/17059748353/Brian has a small inventory of very Rivish bikes, and appreciated our Atlantis'. In fact, on rolling up he mistook me for someone who was to drop by to pickup a bottle of wine, but caught his mistake (and I thought he was just being friendly). We had a good map of the area and were looking for a turnoff from River Rd, and were only a short distance from it. The rest area features comfortable furniture and shade. If you're in the area, stop by for a rest & a chat. He's at about mile 20.1 on the route we followed that day:
http://ridewithgps.com/routes/7850221dougP