The mod adds some trees in the desert, near the abandoned airport. The game looks very good and a little mysterious.
Installation:
File "desertForest.ipl", add to GTA San "Andreas/files/data/maps". File "GTA.dat", add to "GTA San Andreas/files/data/". If you already have "GTA.dat" installed, you can use any text editor to write in "GTA.dat", this text: IPL data\maps\desertForest.ipl