Confusion....

So i clicked the "Download" button next to a map, like the new featured sky zone map for example. Winrar opens it, i unzip it into a folder in my downloads section...but how do i open it in minecraft? it doesn't show up my single player or multiplayer maps... i guess i have no idea what i'm doing... haha, an obvious answer would be alot of help

You have to put it in your Minecraft saves folder.

I like to create a shortcut on my desktop to this folder.

1. Right click desktop and choose New -> Shortcut
   
2. Location will be: %appdata%\.minecraft
   
3. Give it a name
   

Once you do this you can just double-click the icon to open the folder. In here there is a saves folder where you put downloaded worlds.

This is also where the texture pack folder is for adding new texture packs that are downloaded.