The Kaiser Permanente Napa Valley Marathon boasts one of the most beautiful courses in the world. The course runs the length of the famed Napa Valley wine-growing region. It begins in Calistoga, famous for its geysers and curative waters, and winds south along the historic Silverado Trail to finish at Vintage High School in north Napa . Except for the last half-mile, the entire course is rural. Runners are treated to panoramic views of the valley, flowering fruit trees, and dormant vineyards carpeted with golden mustard flowers.