Wirelessly posted (Blackberry8700c: BlackBerry9630/4.7.1.40 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/105)
For parking street spaces are plentiful around here and reasonably priced. In effect 9am - midnight and 1.25 an hour, max 8 hours. There are also fixed priced garages not too far I recall. Finally, the Avis city location is a block and a half away so it can make sense to taxi in from the airport then pick up a car at Avis when you need it. As a bonus you save some of the airport taxes had you rented at MIA.