Because of the darkness, the sky offers at night myriad of bright stars, a spectacular experience for the amateur astronomer equipped with a telescope. A sunset viewed from Mona can also be a remarkable experience. Mona is without any doubt the best snorkeling site of the Caribbean because of its crystal clear waters, allowing visibility as far as 150 feet under the sea. Playa Carmelita is the best snorkeling site. Coral reefs surround the South coast offering a palette of the brightest colors and the most complete reef styles such as the brain-type, the common sea fan, the finger coral, the fleshy and the stony corals.
Colors vary from intense dark violet to yellowish mustard.
Dolphins and humpback whales are also visible during the winter along the Mona shores. The hunting season starts from the beginning of December to the end of April. During this period, hunters can visit the island Monday through Thursday while other visitors are accepted only on weekends. Hunting is allowed to control the growing number of pigs and goats, two unwelcome species that are the worst enemies of the endangered iguanas and the sea turtles. Goats destroy Iguana's nests and the pigs reach the sandy beaches to eat the turtle eggs.