I actually have the day off tomorrow and am riding in Big Bear. I generally mountain bike and there are tons of trails all over that are excellent for mountain biking. As to roadie stuff, lots there are well... you might check into OCW website and their Ride Around The Bear but there bike shops in town who can give you info on the local rides, such as Onyx Summit, etc. I say give up the road bike and start mountain biking - you will be in the mountains for gosh sakes!
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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.