Creating a city map in Illustrator is relatively easy. First, create a new document in Illustrator and make sure the artboard is set to the desired size.
Then, use the Rectangle Tool (M) to create a basic outline of the city. You can use the Free Transform Tool (T) to adjust the outline, if necessary.
Next, use the Line Tool (L) to create a series of straight lines connecting the various points of the outline. You can use the Gradient Tool (G) to create a gradient background color, if desired.
Finally, use the Text Tool (T) to add text labels and other information to the city map.