Wirelessly posted (Blackberry 8830: Opera/9.50 (J2ME/MIDP; Opera Mini/4.0.9751/298; U; en))

Metro Cars is a great option but a rental car may be a better option if you need to get around the city or Metro area. Some parking lots have security. The lot at Henry Ford hospital did at least so I had no problem parking there overnight. Parking in hotel lots and the like should not be a problem but you might want to avoid parking on the street at night as the poster above advised.