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. The shady path is right up Rocco's alley. (Our dog)