I agree the Conch tour is good, BUT if you don't dock in the town, you'll be bused into the town and the folks who drive the busses have the same spiel (bad jokes, weak puns, and all) as the folks who drive the Conch Train. So be prepared to tune out. As with most Caribbean spots there really is not that much to see, but my preference is that the tour guides would just confine themselves to pointing out stuff and relating some history without the jokes and puns.