I forgot to mention... check out the "Santiago Creek Trail"... starts just off Cannon and Santiago Rd. All paved but sortof of urban assault... lots of side trails to explore and alittle bit of everything OC has to offer... minimal climbing (if any).
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Private docent led mountain bike rides through Limestone Canyon. Go to
letsgooutside.org and register today! Also available: hikes, equestrian rides and family events as well as trail maintenance and science study.