Instructions
Press "Select" on the PlayStation 3 controller to bring up the map.
Press "Left" or "Right" to change the map filter until only "Stores" are shown.
Locate the icon for the store you want to visit. Fast food restaurants use a hamburger icon, record stores use a music note icon, clothing stores use a t-shirt icon, a jewelry store will have a diamond icon, tattoo shops will have a "T" icon, the weapon store has a gun icon, a car dealership will have a car key icon, and the vehicle customization shop will have an icon of a wrench.
Press "X" on any icon to set a waypoint on it.
Press "Select" to exit the map. Your mini-map, displayed on the bottom-left corner of the screen, will show you the way to the shop.