Isla de Magueyes & Isla de Monos

Lonely Planet review

Magueyes Island lies about 200yd south of the boat docks and is used as a marine science station for the Universidad de Puerto Rico. The island was formerly a zoo, though now it’s overrun by some frighteningly large iguanas, many of which were originally brought from Cuba. They occasionally make their way to the mainland. Monkeys held for research on Isla de Monos (Monkey Island), about a mile to the west, have also escaped and are breeding ashore – pests to local farmers, but amusement for children and local wags.