Hi!
I am planing this city for a game, the city is situated on a fictional tropical volcanic island.
this is a first time I made a city map, i made the terrain with l3dt and streets with inkscape.
don't worry about bad aligned buildings, this is just a first sketch
Click image for larger version. 

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building colors:
light blue: government
orange: military
dark blue: warehouse
green: parks and squares
yellow: church
white: non important buildings
tips and opinions are welcome