Bay seniors may feel less alarmed about the current drought when they visit the Briones Reservoir in the buxom golden hills above Orinda. The 8.5 square mile body of water is currently 94% full. You can drive right up to the Reservoir and take a jaunt along the 13 mile trail that circles it. You need a Trail Use Permit from EBMUD ($10).No swimming. Dogs must be leashed. Parking $3. It was named after Felipe Briones who built his ranch here in 1829.