Golarion is a pretty groovy world so I thought that I would start a thread where people could brain storm cool campaign, or campaign arc, ideas.
Personally I would love to run or play in a great Viking traveling/questing campaign that took the party through the lands of the savage north: Irrisen, the Realm of the Mammoth Lords, the Holds of Belken, the Cinderlands, the Worldwound, and maybe Numeria and Ustalav.
I also like the seedy decadence of Taldor as a setting for a campaign of redemption. The general sense of eventual oblivion is a great mood setter, and the extravagant finery and pomp decadence of the nobles could really be used well to both contrast with, and draw similarities to, some pretty outwardly grotesque evils. Jaded and drugged out devotees of Zon-Kuthon seeded into the aristocracy pulling the strings towards a doomsday, pseodo-Narnian centaur/gnome/awakened animals cult of Lamashtu/Jubilex festering in Verduran Forest, Sahuagin invasion from the sea, righteous heroes turned terrorists after being wronged by noble houses...yeah.
Feel free to share your ideas.