I met some Druids when I was living in the Bay Area and they are often active at the various Pagan Pride gatherings and conventions like PantheaCon. I always think of them as the "white robed guys with wreaths" as that was often how you could spot their group in a crowd.
I've also got a review of
THE DRUID HANDBOOK up now. I really liked reading more history and detail about this particular Pagan tradition. I can see why it's growing in popularity in California, Oregon and Washington. We're very tree-oriented in this area.