Cheap is a relative word when talking about the Bahamas. That being said, it's my experience that the least expensive airfares, are available by flying into Nassau. More flights, and more carriers servicing Nassau.
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.
There are 5280 feet in a mile. In 1000 feet, one tenth would be 528  feet, two tenths is 1056. There are just under two tenths of a mile  in 1000 feet.