You are free to do whatever you want in the city. Find your car and drive around.
‘ARROWS’ keys or ‘WSAD’ keys to drive the vehicle; ‘SPACE’ key to handbrake; ‘C’ key to change view (camera); ‘Shift’ key to boost vehicle; ‘R’ key to rest scene; ‘G’ key to rest vehicle; ‘F’ key to get on/off vehicle; ‘Page Up/Down’ key to switch gear (manual gear); Tab to toggle pause