This my husband and my second day trying the East Bay Regional Park District Trails Challenge. Today we tried the Cull Canyon Trail: Cull Canyon Regional Recreation Area Chabot to Garin Regional Trail/Cull Canyon Road/Heyer Road/Service Road/ Lake View Trail/Columbia Drive Length: 2.25-mile loop Elevation: 350 feet Location: Castro Valley GPS: 37.710479, -122.055430 We picked this trail because we could bring the dog with us, and it is described as shaded trails, shallow creek crossings, ridge-top breezes. Sounds good. We have a family Welsh Corgi who does not like the heat. He is always enthusiastic about a walk, but if the weather is too hot, he stops at every piece of shade possible. In addition to the trail, the park has a beautiful swimming spot and tables for picnickers. Today was Memorial Day, it was filled with visitors. This is the beginning of the trail. So far so good....