This is a possible involvement for Mackenzie in California, but it seems like a cast of thousands and I've not seen anything further as a follow up as to whether Mackenzie did help in any way, or even make the trip to Pismo Beach on the way from SF to LA or vice versa. Not too far to pop down from Monterey peninsula either. Have this listed as a 'possible but unlikely' in our list of Mackenzie courses.
Tom MacWood first alerted me about this a little while back, referring to a very brief mention in Golf Monthly (1927 Annual) that, "Dr. MacKenzie has been in Australia and is returning via California and it to collaborate in designing Cave Landing, a show links out there, with JD Dunn and two amateurs." Tom thought the course was on Catalina Island but that does not tally with this report that places the course near Pismo Beach.
I had nothing further on this until I found this LA Times article while looking for Dana Point stuff. So its nice to get a corroborating report. The Golf Monthly reference fails to mention that one of the "amateurs" is none other than George C. Thomas!
Interestingly, for those using newspaper archive search functions, this article does not come up under a search using the name 'Mackenzie' as the name is split over two lines in the article, which is a real bummer, and a not uncommon occurrence in newspaper columns. I found it by searching 'golf architect'. I wonder if any GCA contributors know anything further about this project? I hope so. I am assuming that this course was never built, it would have been pretty spectacular if it was, from what I have seen of the Pismo Beach oceanfront on the web.