CALISTOGA — Mt. St. Helena doesn’t pop up in very many books about hiking in the San Francisco Bay Area.It may have something to do with its relative remoteness in terms of travel time to reach the trailhead compared to other hiking trails.But I can think of three reasons why it should get more widespread notoriety:uAt 4,343 feet it is the tallest point in the San Francisco Bay Area and easily eclipses Mt. Diablo that has an elevation of 3,557 feet.uIt offers impressive views of Napa Valley as much asSonoma and Lake Counties.