At 1.2 miles into the hike, you will find yourself on the nearly flat top of Cerro de la Calavera. This is all that remains of a volcano that occupied this site 22 million years ago.

At 513 feet in elevation, Cerro de la Calavera (translated "Skull Hill" and also known as Mount Calavera) rises modestly above lesser hills and valleys of Oceanside, Vista, and Carlsbad ...