You know those squares on the map that lead to sub-zone maps? I was thinking it'd be a nice little minor adjustment to change their "square" borders. All the "squares" currently have white as their border, but for sub-zone "squares" why not make them yellow or red or even a dark gray? Just something to make it visually more clear where the sub-zones are (since there are starting to be a lot of them these days).

It probably wouldn't hurt to have another border color for map areas that have "rooms" in them (such as that mountain square that has the hermit's cave or that graveyard square that has the room with all the skeletons).