In addition to the oft-mentioned Chupacabra(s), Puerto Rico also has a long history of UFO sightings. OVNIS (the Spanish acronym for UFOs) have been regularly reported since at least the early 1970's. A particular hotspot is the town of Lajas in the southwest. In fact, it has become something of a OVNIS Mecca, much like Roswell is to New Mexico and the United States.
The following is from here, which elaborates further:
World attention was suddenly thrust upon Puerto Rico again on May 5, 1997, when reports of a UFO crash near the town of Lajas (famous for the Laguna Cartagena incidents earlier this decade) at 3:25 a.m. erupted on the news wires and on the Internet, producing renewed interest in the island's UFO landscape, which had waned since the cessation of Chupacabras activity last year.
All accounts coincided on the fact that something had happened near Lajas, producing an intense brush fire in the habitually arid region, but the source of the fire became a bone of contention: one band of ufologists claimed that a spacecraft had hurtled out of the sky and exploded, causing the conflagration along with reports of Federal agents who denied the local police access into the area. To everyone's surprise, an astronomer took the side of the pro-UFO faction, insisting that a meteor of that magnitude would have left a tremendous crater, possibly obliterating Lajas and the neighboring towns.