Here is our log of the trails:

Iron Horse Regional Trail 

Arroyo Del Valle Trails at Shadow Cliffs

Berkeley Meadows Loop at Berkeley Marina

Stonewall Fire Trail in Claremont Canyon

DUST Marsh Trail in Coyote Hills

Briones to Las Trampas Regional Trail

Alhambra Creek/Diablo View Trail in Briones 

Sea Foam Trail Loop in Kennedy Grove

Lafayette/Moraga Regional Trail  

Alameda Creek Regional Trail  

Ten Hills/ Cameron Loop Trails in Anthony Chabot Regional Park

Contra Costa Canal Trail

Inspiration Point and Nimitz Trail in Tilden and Wildcat Parks

Carquinez Strait Regional Shoreline 

Contra Loma Regional Park

Morgan Territory Regions Preserve

Redwood Regional Park

Garin Regional Park

Miller/Knox Regional Shoreline

McGuire Peaks Loop in Sunol Regional Park

We finished the 20 trails on May 27.