The regular Pathfinder campaign I am playing in is coming to it's conclusion. We have been meeting once a month (more or less), with 6 players and our DM for over 2 years now, who has been running us through 'The Red Hand of Doom'. We probably have 2 or 3 sessions remaining before the game concludes and this has spawned discussion of what our next game is going to be and who is going to DM it.
I have offered to through my hat into the ring to DM the next game, which is going to be Pathfinder with new 1st level characters. As to what kind of game I want to run, that has been an elusive thing to nail down. At first I thought I may want to do a 'Keep on the Borderlands' and 'Caves of Chaos' type of game. But the more I thought about it, the less interested I became. Sure, it's strictly a dungeon-crawl (cave-crawl?) and there is potential for NPC interaction back at the Keep, but I don't know, just not feeling it.
Then I thought about running a mega-dungeon. This would allow me to reprise using 'Barrowmaze' which I had run as a Pathfinder game a while back for a different group, but that imploded because of gamer flakiness and scheduling conflicts. But the group I am playing with has been pretty solid as far as participation and attendance is concerned. But I don't think mega-dungeons can go the distance in the long run. At some point, dungeon-crawling is going to get old and repetitive and I don't want the group to get bored.
My recent brain-storming has shifted to something a little different. I have been thinking of having the group explore a vast and dangerous jungle region with dinosaurs, white-furred apes, degenerate tribesmen and lost cities of gold. There is a Pathfinder Adventure Path called 'The Serpents Skull' set in such a region in their default campaign setting, but I'm not sure I have the fortitude to run an Adventure Path. I'm not ruling it out, but I would like to work on a story of my own creation. And therein lies my challenge, making up something from scratch. I still have some time to work on this and I have a sourcebook called 'Heart of the Jungle' from Paizo which will hopefully spur some ideas.