Just go to CH play > type Grand Theft Auto: San Andreas > buy it > wait it to install > tap the icon GTA San Andreas or tap "open" in Ch Play > then begin playing.
Unlock the "Flight School" and pass the missions. You unlock this in the mission "Verdant Meadows". You'll need $80,000 to buy the Airstrip. Pro tip: if you don't have the...
Google Earth no longer accepts nor uses user-generated buildings. The old ones are still available through 3D warehouse, but I don't know there's an option to download a few blocks...