Location & Enviroment:
Puerto Rico is located where the Atlantic Ocean meets the Caribbean Sea. Over 60% of the island is mountainous terrain. It is also home to "El Yunque" which is the Caribbean National Forest. Moreover "More than 100 billion gallons (yes, billion) of rain fall here each year, creating a lush forest with plants of incredible proportions and variety. A moist hike or horseback ride take you past 240 species of trees, some thousands of years old, 50 species of ferns, 20 varieties of wild orchids and riotous multitude of flowers." The island is also home to the coqui frog, which is known for the distinct sound that it makes.
One of Puerto Rico's island's, Mona, is home to species not found anywhere else in the world. Overall Puerto Rico is very diverse in flora and fauna.
Region:
Within the overall context Puerto Rico's region is considered "formally" to the United States. However, taking a cultural perspective, in comparision to the United States the island is very homogenous within itself.
Climate:
The tropical climate on the island remains relatively high during the year at around 82 degrees F. Hurricanes are more likely to occur between June to November. Moreover, the central mountain region is known for having cooler spring-like temperatures.
Sources:
http://www.wordtravels.com/Travelguide/Countries/Puerto+Rico/Climate
http://welcome.topuertorico.org/geogra.shtml
