Note : This is not an adventure map. Purely just a little creation of mine. It's unlike Super Hostile. Well, it's a map of amazing mountain terrain. I created this in Creative. So you'll probably spawn in Creative. Sorry 'bout that.
1.Open File
2.Go to (USER) then click downloads. The map shall be highlighted.
3.Extract it to C:\Users\USER\AppData\Roaming\.minecraft\saves
4.Your map shall appear in your Minecraft copy.
Sorry for not making a Mac version. I have no knowledge of how Macintosh works.
Download
Instructions :
(Windows)
1.Open File
2.Go to (USER) then click downloads. The map shall be highlighted.
3.Extract it to C:\Users\USER\AppData\Roaming\.minecraft\saves
4.Your map shall appear in your Minecraft copy.
Sorry for not making a Mac version. I have no knowledge of how Macintosh works.
EDIT : OK, as you all requested, I added screenshots.