I've stayed at the Hacienda many times over the years. On each trip, I've spent time with Alfonso Cuesta. A very interesting man. He was a pilot that would land his plane right on the beach in town. Took his family in the plane on vacations around Mexico. The last time I met him he was building a neighborhood in the desert outside town with just the help of one other person. Took us (myself and traveling companions) out to see it.
Unfortunately, from his son, I learned he died a few years ago at more than 90 years old. I'll miss him.
Found this reference to him and the hotel in the book "Baja Legends" by Greg Niemann.