Have you heard of Los Gatos? It is one of the 3 wild pepper populations sampled in Murillo-Amador et al. 2015 "Baseline study of morphometric traits of wild Capsicum annuum growing near two biosphere reserves in Peninsula of Baja California for future conservation management"
Please only collect here for preservation, these lands are heavily exploited and I would hate to send someone there just to ruin it even more. That said, I would really love some seed if you have a successful collection trip.
Los Gatos is located in a semiarid zone of Baja California Sur, northwest of Mexico (27°01′46″ N, 112°26′59″ W), 680 meter above sea level (masl). Los Gatos is a wild Capsicum population surrounded by some cattle ranches, located in a small range just behind Santa Rosalía, B.C.S., at Santa Lucia Mountain, which joins the Sierra of Guadalupe to the south. This wild Capsicum population is located around the limits of El Vizcaino biosphere reserve, close to the highest hill called La Bandera. Below the Pacific slopes of the mid-peninsular range, the Central Desert stretches from 30°N to 26°N and encompasses the Vizcaino Desert and, to the south of the Madgalena Plain. The soils of this population are shallow, of recent formation and high rate of erosion, characterized as lithosol soils, with low organic matter, have no structure to be composed of unconsolidated material with high sand content. Are set on hills and mountain areas, where the type of vegetation is found of sarcocaule scrub.
If you have trouble accessing the article, published in BMC Plant Biol., let me know.
EDIT: Oh snap I just realized you were talking about the Caribbean island...