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Contra Costa County

Location: Contra Costa County, CA Difficulty: Easy Features: Hiking trails, bird watching, bike friendly, dogs allowed, incredible scenery Briones Regional Park

  Location: Diablo Foothills Regional Park, Contra Costa County, CA Miles: 3.9 miles Difficulty: Easy - Moderate Duration: 4 hours Users: Hikers, dogs, horses, and mountain bikes permitted. Partial