Enjoy a short 1 1/2 mile, 200 foot gain hike and learn about the Tres Hermanos property and Tonner Canyon. Meet at 9:30 am at Grand Avenue Park at 1301 Grand Avenue in Chino Hills. We will meet under the central arch. Bring water and sturdy shoes. Rain within 48 hours cancels. Leaders: Eric Johnson and Margee Hills, 714 366-6571.