Free maps of Tunis and Tunisia are available at the National Tourism Office, to the north-east of the clock tower (directly east of the main Medina gate). The tourist office offers assistance in many languages.
Tunis is well-served by a convenient five-line light metro system run by Transtu. The interchange hubs for all lines are in the center of town at Place de la République and Place de Barcelone.
The TGM suburban train line, starting at Tunis Marine station on Lines 1-4, connects to La Goulette (ferries), Sidi Bou Saïd, Carthage and the beaches of Marsa. At Tunis Marine, be aware that there is an extreme dearth of signage. No obvious signs even say TGM, and on the maps on the trains themselves the station is marked as Tunis Nord. If you arrive at the station on the Tunis Metro, the TGM platform will be perpendicular to the metro cars and is easily accessed across the tracks. Tickets are sold at the end farthest from the metro stop.
Signs for station names along the TGM differ slightly from what appears on the onboard map, but if you can see the signs from the train and it is free of graffiti, a not uncommon problem, it is easy to tell where you are. It is not unusual for the trains to stop and wait on the tracks after leaving Tunis Nord or upon return. This usually does not last an extraordinary amount of time, and you will likely be better off not following the example of the optimistic youths that decide to leap from the car and walk along the tracks into the city.
Many stations along the TGM don't have full-time ticket vendors, so if you are making several trips along the line while visiting Carthage
or Sidi Bou Said, you might be forced to risk traveling without a ticket. The guidebooks say that officials will sometimes get on the train and check tickets, so travel without a ticket at your own risk. It might be safest to buy a return to your farthest destination. The price difference should be minimal, and that way you might plausibly just have boarded the train, and your ticket will be valid for wherever you get on. The safest option will be to check with the ticket vendors or buy a ticket if you can find them.
Taxis are also a good option if you need to go a bit farther than the metro. It's a better idea to hail one on the street; there are a lot of them so you don't need to search for one very long. Assuming they are honest, the meter is a good way to go. Only try to negotiate a price if you know what you are doing and are sure of the value of the trip. Taxis are generally safe.
Transtu operates a public bus network as well. Bus fares depend on how far (how many zones) you will travel.
Otherwise, louages (shared taxis) are the most flexible of all options. The minivans with 8 passenger seats take off when they are full and therefore run on no particular schedule. Prices tend to be a little bit higher than buses, but the difference is usually negligible. The North louage station is in the parking lot of the North bus station. The South louage station is across the street from the South bus station.
Driving is not the best idea for getting around; street signage is faulty, there's a lot of traffic and locals rarely follow traffic rules. Driving is particularly dangerous at dark. Traffic jams are common and around
and Victory Square traffic often come to a total standstill.