A walk sponsored by Marin County Parks through shaded forests and serpentine clearings will reward us with a variety of natural wonders as we explore the upper reaches of the canyon, which still holds water and acts as a magnet for wildlife. This walk is for ages 15 and up. They request that no animals (except service animals) attend. High fire danger may cancel: Call (415) 893-9527 after 7a.m. on the morning of the event to hear a recorded message if cancelled. Questions: Shannon Burke at SBurke@marincounty.org or (415) 893-9520. Meet at the gate at the end of Cascade Dr. Parking is limited, so car-pool or ride your bicycle to the trailhead.