You can reach here easily from Calistoga and it makes a great breakaway for the day.
This is a relatively lightly traveled wine country area and the main town in the region is only about 20 miles from Calistoga.
For that matter, if you miss your turnoff, it may take you all the way to Calistoga before it let's you turn around.
Stroll down Main Street in St. Helena or Calistoga to visit galleries and boutiques.
For Lake County there are small inns at Clearlake or better yet, stay near Calistoga in Napa Valley and make Lake County a 1-day visit, it's only about an hour drive away to the northeast.