Joshua Dyal said:
Read drnuncheon's Freeport story hour for inspiration! That's great city adventuring, IMO.
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(Thank you, sir! The check is in the mail. For everyone else, the link is in the .sig.)
Here's some things that I've learned from running the Freeport game:
The city is a great place for small or unconventional adventuring groups. Because you have an entire community to fall back upon, you don't absolutely have to have (say) a cleric traveling with you.
On the other hand, things are a lot less straightforward. I remember a time when my players crisscrossed the city a dozen times trying to find some vital clue. Because the environment is not as restricted as it is in many other settings, it can lead to scope issues like not being sure where to go next - or maybe going in a direction you don't expect at all.
Because of the above two, you need to design your scenarios a little bit differently. I like to have multiple plot threads going at the same time - it helps give the feel that there's more going on in the city than just what the PCs are interested in at that moment. I also try to design them so that they're basically the outgrowths of what the NPCs are doing, and then open things up so that the PCs can mess with it.
Most of your opposition will be NPCs. If you follow the guidelines for NPC equipment in the DMG (and assume they're carrying it all), your PCs will wind up with way too much stuff. Potions and scrolls are probably the best way to handle this problem, because they are self-correcting: once the player uses them, it's no longer an issue.
For some great advice, check out Johnn Four's roleplayingtips.com - it's got several articles on cities.
I think city-based games have the most potential of any setting, simply because they can encompass all sorts of things that dungeon and wilderness cannot (not the least of which is the degree of social interaction possible.) I know my players have particularly enjoyed seeing their characters grow in comparison to the rest of the city - from being no-name Watchmen to being about as well known as the members of the Captain's Council.
J
...also kicking off a PS3e/Sigil game.