"This athletic loop, a perfect cool-weather outing, uses the Ohlone, Manzanita, Lime Ridge, and Paraiso trails to explore the rugged, chaparral-clad hills northwest of Mt. Diablo on the border of Concord and Walnut Creek. You go through a gate and walk uphill to an information board and the Ohlone Trail. Bearing left, you climb moderately on a dirt road to a junction, where the Paraiso Trail, which you will use later, joins from the right. Turning left, you soon go through a gate into the Walnut Creek Open Space Lime Ridge Preserve, which is closed to dogs. Coast live oaks, blue oaks, and California buckeyes line the route, which also passes hillsides of chaparral, mostly chamise, toyon, California sagebrush, yerba santa, manzanita, and black sage."