As for a graveyard - I don't know yet. One of the things culturally in this setting is a tendency to burn the dead - thus preventing their rising as undead later on. Although, graveyards do make for cool map features. Since space is highly limited on the island, the thought had also occurred to me of doing a single large mausoleum whose main purpose is as a city-wide burial vault. Not very interesting map-wise, but it could be cool game-wise. Then of course, there is also the catacombs approach.
Which actually brought up the idea of sewers and drainage - up til now I hadn't given that much thought either.
Alas...this project just keeps getting bigger and bigger!