Updated March 2019
Tourism collapsed after the 2015 attacks in Tunis and on Sousse beach, but in 2018 the British FCO revised its travel advice. As the FCO map correctly suggests, avoid the Jebel Chambi hills west of Kasserine and even west of El Kef. There are regular AQIM attacks from Algeria.
Plus of course, avoid the Libyan border. 

Tunisian dinar exchange rates

FCO-TunisiaPrice of fuel
Unleaded petrol 2.05 TD/litre; diesel 1.8 TD (less than half average Eu price).


Useful languages
Arabic, French, English

Required by all except citizens of EU countries, Canada and USA.

Border formalities
If you’re ferrying from southern Europe do your formalities aboard the ships from Marseille or Genoa if they are CTN ships; it means you get out of the port more speedily. With SNCM (French) ships you may do it in the port.
At La Goulette (Tunis port), most recent reports (2018) say no funny business as occasionally occurred in the old days.
No carnet required. If you can get it, a Green Card extension to your EU motor insurance is valid in Tunisia or buy local motor ‘assurance’ at the port easily enough. No one checks except when you come back from Algeria where you had to pay 1TD for a new driving permit (so keep 1TD coin handy).

Desert pistes
For Brits (as opposed to Europeans, especially further east) Tunisia is a long way and an expensive ferry compared to similar Morocco and desert-wise, there’s less going on here. Algeria’s Grand Erg Oriental spills over the border so there’s much more sand than Morocco. but you need a permit and a guide to get to some desert areas. The far south is a military area.