Join Berkeley Path Wanderers and East Bay Park District Naturalist Dave Zuckermann exploring the historic Alvarado Park section of Wildcat Canyon Park, 10 am Saturday, Jan. 20. This 2.5 mile, moderately paced walk will explore the creek, 1930s stonework, and fascinating ruins. Bring water and snack; dress in layers and be prepared for mud. Meet at the East Bay Regional Park District staging area off of Park Ave., 0.1 mile off McBryde Ave., in Richmond. Driving directions at www.berkeleypaths.org or www.ebparks.org.