Having lived on St. Thomas in the U. S. Virgin Islands for more than a year when I was younger, I can provide you with some of my own personal pro-and-con experiences. The beauty of awaking each day and seeing beautiful blue skies and blue waters surrounding you is a memorable experience and certainly one of the best reasons for residing on an island. If you are a beach lover like me, the never-ending choice of beaches from which to choose means that you will never be bored with the same old waters or view. St. Thomas has dozens of beaches to utilize, and nearly all of them offer multiple reasons for returning to them: white sand, extensive sea life (from fishes and crustaceans to coral heads), snorkeling and scuba diving, boating and fantastic views. For seafood lovers, there is plenty available, both in restaurants or in the waters to be caught. For boaters, the waters there are generally calm and there is plenty of charter boats available in all sizes if one does not own their own. Island communities are often small, and they are usually tight-knit yet welcoming to both residents and tourists. For statesiders, St. Thomas offers a great mix of Danish, French, and West Indian customs, allowing you to feel like you are living in a foreign land while still in American territory. There is a great offering of varied music, from calypso to soca to modern styles, and their is plenty of live festivals for the inhabitants to enjoy.
As for the cons to living on an island, there really is a thing known as "rock fever"--a feeling of being trapped on a nearly inescapable isle. Unlike most states, you can only drive a car so far on an island, and an island as small as St. Thomas (28 miles in length) can often feel restrictive. It takes a plane to reach the mainland, and the time and expense usually limits a person's ability to travel. Boats can take you to nearby islands, such as St. John, Puerto Rico or the British Virgins, but you are still on an island! Things are usually expensive on most islands since most items--from food to gasoline and automobiles to clothing--usually has to be imported. There is nothing like island life, but it is usually best for people who are wealthy or who simply wish to vacation there.