these maps are the essentials for any sa fan
Vehicle locations: http://db.gamefaqs.com/console/ps2/file/grand_theft_auto_sa_vehicle_loc.png
Weapons/items location: http://hem.bredband.net/708145/weap.html
Secrets map: http://db.gamefaqs.com/console/ps2/file/grand_theft_auto_sa_secrets.png
just copy and paste them in your browser and enjoy
when you really think about it can you prove anything? can you even prove our existance? no, its impossible!