Cagliari is the capital of Sardinia.
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.
It's really difficult to get parking and drive in rush hour even if road network has been recently improved.
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.
You'll be better off wearing comfortable shoes, though. The old town of Cagliari lies in a somewhat steep hill, so you'll 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.
Cagliari is known as "The City of Sun", so you must have a full relaxing day on the wonderful Poetto Beach. This 8 kilometers long beach will excite you and is perfectly equipped to satisfy every your wish. You can get here by buses PF,PQ,3P,9P.
The beach is divided to free parts and 'beach clubs' that charge you with entry fee and rent you umbrellas, deck chairs etc. Prices are around 3€ / entry, about 12€ for a umbrella, one deck chair and one sun bed. The 'club beaches' clean the sand each night and provide you with showers and toilets too.
Most of the shops are concentrated in a couple of areas: Via Roma and Largo Carlo Felice, the pedestrial roads Via Manno and Via Garibaldi, and the part of town around Via Alghero, Via Paoli and Via Dante. Lots of beautiful shop are concentrated in this areas which could remind you of Copenhagen's Strøget.
There's a LOT of restaurants in the old town area, and you probably will not make a bad selection anyway since the food seems to be top class at least if you enjoy seafood. A dinner for two with little house wine, There's a good pizza place tucked away in the side streets in the Marina district, l'Oca Bianca. You should make a reservation, though.
There's a few places to enjoy lunch salads at the Piazza Yenne, and a wonderful Gelateria if you don't want to eat too heavily during the day. These places double up as decent eateries by night.
The whole area around Cagliari gives host to a number of accommodation options including the world famous Forte village and the stunning hotel le meridien located on the white sandy beaches of Chia.