San Juan is a hub of tourism in the Caribbean. Since Puerto Rico is a commonwealth of the United States, US Citizens can travel freely to/from Puerto Rico. The San Juan port and airport are used by many U.S. tourists enroute to their cruise ships or enroute to the Virgin Islands. The currency used in PR is the U.S. dollar. Even though Spanish is the official language, most people also speak English. You will never go hungry in Puerto Rico, since most American fast food chains also do business in the island.