I have not. But it’s now on the list. Thank you. And welcome to the 'Dope; it’s an interesting and quirky place to visit all by itself. Hope you’ll hang around. It might grow on you. Sorta like mold on Florida house siding.
I enjoyed St. Augustine as a historical town and as a tourist attraction, but I did not see anything significantly special about their beaches. Which what the OP was mostly asking about.