GRAND THEFT AUTO: SAN ANDREAS UNLOCKABLES
Hustler
Complete Burning Desire mission to get Denise as your girlfriend. Keep going out with her, and eventually she will give you the keys to the blue car parked at her house.
Hunter
Complete pilot school with all gold awards. The helicopter will be available at Verdant Meadows Airstrip.
Hydra
Complete the Madd Dogg's mission "Vertical Bird" to gain access to the Hydra fighter jet located at the abandoned airstrip in the hanger.
JetMax
Complete boat school with all gold awards.
Jetpack
Complete the Aircraft Boneyard asset and the Jetpack will be available near the entrance to the save area.
Marquis
Complete boat school with at least all bronze awards.
NRG-500
Complete bike school with all gold awards.
Rhino
The Rhino Tank has twelve wheel drive. In a way it is like the Monster Truck -- you can hold R1 and it will drive easier in turns.
Squallo
Complete boat school with at least all silver awards.
Super GT
Complete driving school with at least all bronze awards.