This route packs an absurd amount of Marin beauty into 100k: the Golden Gate Bridge, Hawk Hill, Alpine Dam, the Seven Sisters, and the summit of Mount Tam. The views are staggering throughout, from the Golden Gate and coastal headlands to redwoods and ridge roads. The route ends with one of California's iconic finishes: a perfectly-slalomed descent down Panoramic into Mill Valley then a short cruise through Sausalito and across the bridge back to the start.