I'm gonna go against the grain and recommend you try a hexcrawl or a gazetteer. Those are prewritten lists of Things That Can Happen At This Location and you assemble your own campaign out of the shit that happens to the party.
They need to go see the local Lord, but the short path has the annual tree migration going on, and the longer way cuts through the Dismal Dread Swamp and that shit's full of will-o-the-wisps that'll try and lure you deeper into the mud. What do the players choose to do? How do you, the GM, operate the world and the possible events in response?
I'll even go so far as to drop my personal favorite The Runewild. Great setting.