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.
One mile consists of 5,280 feet. The foot and the mile are units of length in the Imperial system of measurement, which is the system used mostly in the United States. One foot equals 12 inches, and 3 feet equal 1 yard.