Finish 15 levels of Vigilante side missions.(Its alot easier doing it in a tank spawn Rhino)To get a tank enter the cheat in gameplay UP,L1,DOWN,R1,LEFT,L1,RIGHT,R1.

Own all 30 bussiness and you will get a bulletproof bussines car.

To find a helicopter you first need to do all story missions. The location it is in H