it aint a lie fly to the bottom south east corner and fly straight for about 20-30 minutes (real time) then the best way is to jump out and kill yourself. when you are back in hospital, gang territories should appear in san fierro and maybe in Las Venturas. I did it before and it worked. It is a glitch, and a very good one
"THIS IS A MAXIMUM SECURITY PRISON AND YOU HAVE NO WEAPONS OF ANY KIND?"
- Lieutenant Ellen Ripley, Alien 3