Cagliari is the capital of the island of Sardinia, an autonomous region of Italy. Cagliari is called Casteddu which mean "the castle" in the Sardinian language. It has population of about 172,000 inhabitants, or about 303,000 including the suburbs and metropolitan area.
The beach is a good place to start on the warmer months. Take advantage of the mild weather and water. Or if swimming is not you agenda, long walks on the shore are perfect. Relax the day or night away.
The San Benedetto Market is another great area that you should visit. This is an open air market that is tons of fun. Very vibrant and full of energy, this is one place you cannot pass up.