There is a scenic railroad tour (http://www.stkittsscenicr...) that goes through portions of the narrow gauge railroad formerly used for the sugar mill. If more than one large cruise ship visits the island, organized train tours can fill the train.
Micro buses form the public transportation system on the island. These are much cheaper than taxis and can be flagged down while in route. If they are full the driver will flash their lights and proceed on. Service does not generally extend to Frigate Bay or the Southern Peninsula. That is the domain of taxis. Taxis and Buses use the same format of Micro buses, the difference is that taxis have a yellow license plate and start with the letter T and buses have a green one which starts with the letter H. Bus fare varies but in 2005 was between 1.25 EC and 5 EC depending on length of trip.
Taxis and buses outnumber those needing them in St. Kitts. Be sure to negotiate upfront the costs of the trip, pay special attention if the fare is in US or EC dollars.
Temporary drivers licenses are available, as well as several car rentals agencies.
There are many popular tour guides in St. Kitts that will give you a tour of the island. One such tour guide is Thenford Grey's Island Tours or Grey's Island Excursions (http://www.thenfordgrey.com).