The nice thing about the 1983 box set is that its vague. Don't get me wrong, there's lots of great stuff in the book.
I initially thought that I would run either "Against The Giants" (the tale of the yawning portal version) and or "Expedition to the barrier peaks". However after a brief conversation with Scott Charlton he reminded me of "Against the cult of the reptile god", which I've always wanted to run. That might be a great starting point. Rather than use it in its original location, I'll just plop it somewhere in Geoff. Although the initial location isn't that far away from Geoff.
A few minor things I'm thinking of game wise:
1. Initially I decided that I might outlaw monks as a class (as it just doesnt' fit in my brain), However it was pointed out to me that there are ton of different kinds of monks other than the typical "Shoalin" ones I have in my brain.
2. Whilst I'd love to say "Basic four classes only" I'll get spit on. So all of them in the phb will be allowed, however no "unearthed arcana" and splat books stuff.
3. side initiative. I want to try it again, I really enjoyed it in my mutant future game.
4. Only the races that are highlighted in the 1983 book will be allowed, (if I'm not mistaken that's humans, halflings, elves, half orcs, dwarves and possibly gnomes? gotta check that). As well everyone will roll on the "Where am i from tables"
5. Obviously no feats.
6. Toying with no cantrips however see #2 getting spit on.
7. I want it gritty. I'm going to hand out XP for gold and monsters. (keeping the same XP charts from 5e however). Healing will work like this: Full Rest is a week of downtown, get up to maximum hit points. Short rests you are allowed to expend hit dice.
8. Considering upping the death save to 15.
The campaign is as follows:
Against the cult of the reptile god
Expedition to the barrier peaks
Against the Giants or alternatively "the liberation of geoff"
I may also insert "white plume mountain" in there somewhere.
Helpful Greyhawk Links
The most helpful site: http://www.greyhawkgrognard.com/
Nifty map link: https://atgiants.obsidianportal.com/wikis/grand-duchy-of-geoff
Even more maps: https://ghmaps.net/greyhawk-maps/online-map/
Flanaess Heraldry Collage: https://ghmaps.net/flanaess-heraldry-collage/
City Map Generator: http://inkwellideas.com/free-tools/random-city-map-generator/