You'll be able to get all the information and maps you need at the  Cork Tourist Office  at 42 Grand Parade.

THEY PROVIDE  a free A3 size map of Cork City Centre which is very detailed and helpful. 

During the main tourist season (May to September) try and get to this tourist office as early as possible in the morning, as it is a busy place by midday. 

The phone number is (021)4255100.  

The tourist office is open Monday - Friday 9.15am to 5pm.  

On Saturday it is open from 9:30am to 5pm.

On Sunday, the tourist office opens only during July and August from 10am to 5pm 

On Bank Holiday Mondays, the office is open from 10am to 5pm.

More Cork City info available on the Cork-Guide site, the Cork Tourist site and the West Cork region

These sites are very good references:

Cork & Kerry Tourist Information Offices     This link provides basic details about the major tourist information offices. Just click on a name to get complete address details.