I'm not sure that can be done. You may need to hire a private driver, try www.extranomical.com
No practical way of taking public trans from San Francisco to Calistoga--which is at the northern end of the Napa Valley. You will need to rent a car, hire a private driver (extremely expensive for that distance/time) or try to find a day tour that inc's spa time. Wish I knew of one to refer you to, but don't. Perhaps others will advise--or why not contact some of the Calistoga spas and see if they have any recommendations for you. You can also look into San Francisco spas that offer the mud experience.
I have one more company you can try - they only pick up from SF hotels - www.vinambassador.com
This is about the only public transit option from San Francisco to Calistoga: Golden Gate Transit to Santa Rosa or Vallejo Ferry to Vallejo, then a regional transit bus to Calistoga. It seems more complicated than a visitor with limited time would want to deal with.
Another thought: most people who go to Calistoga for the spas will tell you they are very relaxing. Most folks want to go to sleep, or at least rest for awhile, maybe have dinner or do something else enjoyable, even stay overnight to get the maximum benefit from the treatments. I think what this means is that something is lost when you have your treatments and then rush back to the City.
If you go up for a mud bath, why not do the whole routine (mud, mineral soaks, perhaps a massage and facial), and spend the night? Have a leisurely dinner. Wake up in the morning, take a dip (most spas with lodging have pools), then return to San Francisco. This would be more relaxing and also make it more worthwhile if you're going to take the time to go up on public transit or pay to hire a driver.Edited: 14 February 2010, 05:58
Thanks for the information. I do realise it will be quite rushed, but is the only way I can do it. And we will get to see some of the countryside on the way. Possibly sleep on way back.
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