Okay. You've forced me out of hiding in lurkerdom.
I can think of three options for integrating a druid into Freeport with minimal muss and fuss. Just because it's an urban environment doesn't mean that nature is in absence; it's just pushed to the side for most people. There's no reason that the druid can't keep trying to bring it front and center.
Firstly, there's the ocean. That's a pretty large part of the natural world, and of HUGE import to Freeport, so it seems a good fit for a character who venerates/protects nature. In WotC's "Masters of the Wild" there are a few prestige options for druids who focus on the ocean (and other aspects of the natural world) rather than falling into the ubiquitous 'woodland' mold. That product might give you and/or the player a few ideas on how to explore a non-stock druid type. Animal companions of a marine variety are somewhat problematic for land-based adventures, but if most of your non-trilogy adventures will take place at (or under the) sea, such helpful critters might be particularly valuable.
Secondly, there's the jungle. Every part of Freeport that doesn't abutt the ocean is bordered by jungle. A druid who focuses on the jungle will be closer in many ways to the traditional character type as set down in the Player's Handbook. It will still require some fine-tuning to bring such a druid more fully out of the temperate forest and into the tropical but in general it seems like an easier fit. A Tarzan concept comes easily to mind. The problem with animal companions for this type of druid is not so pronounced as with the former suggestion, but I still don't think that a jaguar or wild boar would be too welcome in the streets of Freeport. Well maybe in Scurveytown.
Thirdly, there's the city itself. This concept is getting pretty far away from the druid "ideal" and should be thought about quite a bit before you implement it; I'm not sure what it will do to your campaign long-term. The so-called urban druid has been explored in other game systems, but not d20 as far as I know. It nonetheless seems feasible. Of course, such a character would likely get most of his/her animal companions from the Vermin category, but if you and the player can both accept that it might make for an interesting variant on the traditional tree-hugger. "Masters of the Wild" presented a similar variant of the Ranger better suited to urban locales.
<font size=-1>[ This Message was edited by: Jon Potter on 2002-06-24 14:45 ]</font>