This link goes to a thread which talks about ideas for fantasy races:
http://forums.sjgames.com/showthread.php?t=58998
Although it doesn't necessarily discuss campaigns or adventures, there is some interesting discussion about how campaign feel may or may not interact with the type of characters and character races found in a campaign. There are also a variety of ideas for different races. Some of these ideas might serve as a spark to ignite your imagination and help to build a campaign or adventure.
This link will lead to a campaign path which I helped work on over at the WoTC site:
http://forums.sjgames.com/showthread.php?t=60286
Unfortunately, much like the other project, it died out. There's still enough there (including a map) to provide a campaign path though. You'll need to convert some of the ideas from D&D to GURPS, but it shouldn't be too difficult.