The roads on the Internets are infinite. A simple question lingered on myself, which Hilda promptly answered. Were there bullfight arenas in Puerto Rico in the past? With real corridas? –Yes, she said. I remember one in Isla Verde, she reminded.
An easy googling produced the evidence. Indeed at Isla Verde (not far from the San Juan airport) there stood one. Viva Internet!
[Plaza de Toros, Isla Verde (1960s). Photo by Hernán Bustelo, Flickr.]