Coming June 8, 2014. THE oldest race in America. First run in 1905, the Dipsea is a scenic 7.4 mile course from Mill Valley to Stinson Beach (in Northern California). While the stairs and steep trails may make it grueling, the views of the Pacific make it one of the most beautiful courses around. Note: the Dipsea is popular, and because of safety and environmental concerns the number of runners is limited to about 1,500…. so sign-up fast.