What is the setting of The Log from the Sea of Cortez by John Steinbeck?

The Log from the Sea of Cortez is set along the route taken from Monterey Bay, California to the Sea of Cortez and back again. Specific settings include Cabo San Lucas, Pulmo reef, Point Lobos on Espiritu Santo Island, El Mogote, Amortajada Bay, Marcial Reef, Puerto Escondido, Coronado Island, Concepcion Bay, San Lucas Cove, San Carlos Bay, San Francisquito Bay, and Angeles Bay, as well as the port towns of La Paz and Puerto Escondido.