Off-road carts can be rented on Salt Cay for both day trips and overnight stays.
If you're visiting Salt Cay, you don't really need a map. However, your hotel/villa probably doesn't have one so you may want to download and print our map of Salt Cay before arriving. From Northeast Point to South Wells (the southern tip of the island) it's 4.3 miles.
There are no surfaced roads on Salt Cay, and the primary method of transportation are bicycles and off-road golf carts. Many villas provide a cycle, and there are two businesses offering golf-cart rentals. It's highly recommended that you consider one of these vehicles, as the sun is extremely intense and the shade provided by the cart's canopy will be highly appreciated.