I want to be able to get the absolute path of the Minecraft directory.  I tried

 

Minecraft.getMinecraft().mcDataDir.getPath());

 

But it just returns a period.  How can I get the path of Minecraft?

To save data not associated with any block/part of the map, I will have to write to a file, unless there is a way to do that.  (Namely save ItemStacks not tied to a block/entity, and some custom datatypes).

There is the world folders you should be saving this into, not the root minecraft folder.

Well I was going to modify the string to be MCDIR/saves/worldObj.getWorldInfo.getWorldName()/ but is there a simpler way to get the path of that?

I was looking at WorldSavedData and it seemed like it doesn't do what I want it to do exactly.  It's more like is there a NBT tag associated with the map itself that I can access?