If it's free scenery you're after, have a look here:
OpenX requires you to download the OpenSceneryX library then the scenery will work. Believe me. Some of this stuff is really good.
The free Hong Kong scenery in OpenX is better than the payware Kai Tak scenery of Fly Tampa. I've had both. Bad thing about XPlane is the really quality planes you have to pay for. However you can come across a gem or two if you look around a bit. Hope this helps