There was a time when Acapulco was better known abroad than Mexico itself. After the 1959 Cuban Revolution, the world’s playboys made the city their party home. Everyone who was anyone wanted to be there. Frank Sinatra, Cary Grant and Johnny “Tarzan” Weissmuller were among the stars who bought homes in the city, with sparkling views over the golden beaches of a picture-perfect horseshoe bay. Even in otherwise closed-off countries like China and…