A couple of my most sucessful campaigns were focused on the Wild Coast area, and the Shield Lands (pre wars). Not that the PCs didn't travel to other places but those areas got the lion's share of the PCs adventuring careers in thier respective camapigns. Another shorter game which I would hesitate to call a campaign was based in the Vesve Forest which was a blast. I also had the pleasure of being a player in a campaign based in the Nyrond area which was quite enjoyable.
You really can't go wrong in Greyhawk there are just sooooo many places with nearly unlimited potential for adventure and intrigue.
You really can't go wrong in Greyhawk there are just sooooo many places with nearly unlimited potential for adventure and intrigue.