This last tourist town in Napa Valley was named by Sam Brannan, entrepreneur extraordinaire and California’s first millionaire. After making a bundle supplying miners during the Gold Rush, he took advantage of the natural geothermal springs at the north end of Napa Valley by building a hotel and spa in 1859. Flubbing up a speech in which he compared this natural California wonder to New York State’s Saratoga Springs resort, he serendipitously coined the name “Calistoga,” and it stuck. With 5,190 residents and an old-time main street (no building along the 6-block stretch is more than two stories high), this small, simple resort town is popular with city folk who come here to unwind. Calistoga is a great place to relax and indulge in mineral waters, mud baths, Jacuzzis, massages and, of course, wine. The vibe is more casual -- and a little groovier -- than you’ll find in towns to the south.