On Tue, 20 Aug 2013 12:24:03 -0700 (PDT),
wrote:

Going on a 3 day Bahamas cruise and we have to go by car so is there any safe/convenient alternative to the ludicrous $20 a day parking at the Port?

Go by rental car. The day before the cruise turn it in at the
airport. Get a taxi or shuttle to a hotel that has a shuttle to
the port the next morning.