the commonwealth of puerto rico includes the largest, main island and a number of smaller islands, including mona, vieques, and culebra. of those three smaller islands, only culebra and vieques are populated all year. mona is unpopulated, but employees of the puerto rico department of natural resources sometimes visit the island to inspect it and its wildlife. people can visit the island for hiking and camping by getting the permission needed. san juan, on the northern side of the main island, is the island's largest city and the capital of the territory. the common languages are spanish spoken by 94.7% of the population and english, spoken by 5.3%.