I was looking at these two inparticular:
http://library.avsim.net/search.php?SearchTerm=Rotorua&CatID=fsxscen&Go=Search
I read that if you mix the top two you can get a really awesome place to fly around. Check out the screenshots on this page:
http://www.nvnews.net/vbulletin/showthread.php?t=78216&page=37
And what's more is that its free! I have yet to try it, but I can't wait

Does anyone else know where you can get some really good (and free hopefully!) scenery for FSX so we can all get our games rigged up with the best scenery you can get!
All the best
DazzleStar