the East Bay parks are gems. the selectionf hiking trails is great and the maps are clear. We often hike at Briones because one gets great views and can do a circuit. We have hiked in most of them and they are all very good--Sunol, Black Diamond, Sibley, ..the list goes on. Some have limited parking and others charge a nominal fee. In the spring these parks are green and many have beautiful wildflowers. A great resource.
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