From Save Mount Diablo:

Shell Ridge Open Space Loop Hike
Tuesday, April 15
10am - 12pm

Beautiful rolling hills, a meander through an oak woodland with wildflowers, views of Mt. Diablo, birds, and a lovely small lake near the end of the loop. Be sure to bring plenty of water, a snack, and dress in layers. Sturdy shoes or hiking boots, hiking poles and binoculars are recommended. Heavy rain cancels. No restrooms.

Participant Limit: 20 people

For more info and to register, visit: https://savemountdiablo.org/event/shell-ridge-open-space-loop-2/