By car
It is really difficult to get parking and drive in rush hour even if the road network has been recently improved.
By public transport
Cagliari Public Transportation CTM provides an fast and efficient service to get around in Cagliari city and suburbs.There are about 30 lines of buses and four new metro lines are in progress. At least the bus traffic is amazingly efficient and reliable to Italian standards.
Transport Map:
On foot
The best thing you can do is walk through the old city and discover it. Almost everything you have to see in a quick visit of Cagliari can be joined by a pleasant little walk.
Wear comfortable shoes, though. The old town of Cagliari lies in a somewhat steep hill, so you will be walking uphill or downhill most of the time.
There are clean public toilets in the building on the Pontile Sanita ferry wharf, near the bus terminal.
By bike
The Cagliari bike station is in the centre of Cagliari, inside the parking area, at the train station. (http://www.ichnusabike.it)