Books that I have read include: El Camino Real. The Golden Road: The Story of California's Spanish Mission Trail by Felix Riesengerg, Jr.(1962). Two other books are Helen White's El Camino Real de California (1956) and Edwin Corle's 1949 book The Royal Highway (El Camino Real). Charles Outland published a book that might be helpful: Stagecoaching on Camino Real Los Angeles to San Francisco 1861 - 1901.
Missions in Movies and Books
Island of the Blue Dolphins is a great book. It is, of course, a book of fiction so there is no absolute answer to your question. O’Dell grew up along the California coast, primarily in San Pedro. The Channel island of San Nicholas is about 52 miles off the coast, west of San Pedro.