Cowell-Purisima Trail in Half Moon Bay is Managed by the Peninsula Open Space Trust and the Coastal Conservancy. It's a flat 3.5 miles (7 miles up and back) that curves around the bluffs and hugs the adjacent ag fields (watch for resident cows, alpacas and a donkey). It has spectacular views of the ocean (great for whale watching in season), wildflowers, and access to Cowell Beach at the north end. One of HMB's best walks!