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Marin hikes are the most viewed activity month after month on DogTrekker.com, for good reason. Today, the Marin County Open Space District administers 34 preserves—all but one of them dog-friendly—totaling more than 200 miles of trails for locals and visitors to enjoy. To find a park or open space, check out the guide on DogTrekker.com, which includes descriptions, distances, difficulty levels, maps and more.