I made a world and am going to rely on it because I suck at writing adventures. I have that "failed novelist" problem that so many published scenarios have, and am sick of trying to write like that. Hence the idea of a sandbox has a lot of appeal to me. And being a Latin buff, I got the Tolkien bug and needed an outlet for that, though I wouldn't make my players pick those names if they didn't want.
So, for my players, you can look at the following things:
Map of Mīsarkênē, the County
Map of Mīstássun, the Town
Maps of the market villages in the County
Calendar of the world