Thanks Cy. I'll update my original post with the detail on Coyote Canyon/Creek. The map is used is the park's map which is available as a PDF here: http://www.parks.ca.gov/pages/638/files/ABDSPmap.pdf
One question for you. The route highlighted in yellow definitely goes from the Lower Willows to the Upper Willows right? The PDF image I have doesn't show a connecting road but from what I've read there is one. I'll add your route to my map in a coming update.