There are several tourist offices in Gibraltar:

The easiest to get to is in Casemates Square near the town gates: The Piazza, Main Street (350) 74289.

There is also an office to the side of the Anglican cathedral (close to Bristol hotel): 18-20 Bomb House Lane (350) 74289.

And an office in John Macintosh Hall (walk right to end of Main Street, straight over road, continue on, the office is on right): John Mackintosh Hall, 308 Main Street (350) 75669.