"Soak in a Mud Bath Calistoga’s most storied mineral baths are the centerpiece of what has becomeDr. Wilkinson's Hot Springs Resort,fittingly named after a chiropractor from San Francisco. Most visitors still come for the day spa, which is split into two sides, one for men and the other for women. Options for bothinclude mud baths (in a mix of volcanic ash, hot spring water, and peat moss), mineral-water whirlpool tubs, mineral steam rooms, blanket wraps, and massages. Then, of course, there’s “the Works,” a signature treatment that combines all of these into one. This treatmentused to cost less than $5 back in 1952, when Dr. John Wilkinson opened the place. Rumor has it that since then, all that’s changed is the price."