The Ibiza island can be divided into 5 zones:
Ibiza town, also known as Eivissa, is the capital of the island with one of most panoramic harbours of the Mediterranean sea and it is characterized by the colossal medieval walls of the old suburb called Dalt Vila (declared a world  heritage by UNESCO) that provides an evocative background and contains the eldest palaces of Ibiza like the castle and the Cathedral.
Sant Antoni:
It offers a fair number of bars in the west area as well as the best clubs such as Eden and Es Paradis and also elegant chillout bars.
Santa Eularia:
this pleasant sea city hosts an attactive coast and a historical districy on its hills.
It is famous for its Carrer Sant Incent street full of restaurants that serve tapas.
North Ibiza:
The north side of Ibiza is less populated and its countryside is a mixture of fields that surround small towns and pinewood forests.
South Ibiza:
Characterized by dozen of coves infiltraded in the crystalline sea, the glittering salt mines and the remarkable Es Vedrà islet make this south side an extraordinary exciting place that need to be seen.

Some Numbers about Ibiza

Ibiza Dimensions: 572,6 km

Population: 106,000 inhabitants

Restaurants: 632

Night clubs: 85

“Blue Flag” beaches (European Union): 28

Annual Visitors: 2 million