If driving, rental car agencies include Alamo and Hertz. Buses and taxis also provide good ways of getting around. Distances between sights make walking an unpopular option, as does the street layout in the city; San Salvador is not a square city, but has long avenues that are straight and streets that aren't. That said, in some areas walking is a great option, such as in Zona Rosa.
El Salvador now has a well developed GPS navigation system called QFind (http://www.elsalvadorgps.com/) that can help you move around either in urban or rural areas. This is a fully functional system with thousands of points of interest and turn by turn routing to your destination.
Another option for luxury transportation is Linea Ejecutiva (http://www.lineaejecutiva...), they bring private transfer. If you want, you can contact the Bureau of Conventions of El Salvador to visit the country.
By train
All rail transport in El Salvador was suspended in October 2002.
In 2006 a pilot scheme for reviving the rail network commenced and in 2007 a service to between San Salvador and Apopa was restarted with two return trips each morning and evening aimed at commuter traffic. Whilst this will be of little use to travellers, it is hopefully a sign of future reopening of more of the extensive rail network.