Glad to hear it.
One more, though it is absolutely out there:
You could always use something like Return to Dunwich/H.P. Lovecraft's Dunwich. It was a sandbox campaign for Call of Cthulhu. Even though it takes place in the 1920's, Dunwich is an older town with less amenities. It provides a lot story seeds, and story arcs. A lot. The village has piles of secrets. There is also a cult hidden there, ancient ruins, cthonian horrors, and just a cool, dark sandbox.
You would have to throw out some of the plots (bootlegging, etc) and change some of the weirder shit (maybe make the Hyperborean ruins into an ancient Elven ruin) but it works great at a sandbox that can give you piles of filler and story seeds if you combine it with another adventure.
Just a suggestion.
Happy gaming!