Got a great deal on hotwire, for three days, around $20 a day.  You have to take a shuttle from the airport to the car rental.  You walk to the second island outside of baggage claim, the buses run quite frequently, were there 3 lined up to pick people up when I arrived at 11:30am on a Friday.  The ride only took 5-10 minutes.  \nThe rental facility is huge and nicely air conditioned.  When I walked up to the Hertz rental, there must have been 30 people ahead of me, around 5 sales people and took around 45 minutes before I was helped.  In fact, I was pulled from the line to follow an attendent downstairs, where there were 3 sales people to help ring us up.  \nGot upgraded to a compact with a GPS since they ran out of subcompact.  Loved the GPS during the stay, I want one  at home now.   The car is a little dirtier then other rental places, the carpets had stains and the outside had some marks on the paint but I still would take the GPS over those aesthetics.\nFinding the car was easy, in numerical order and all was covered.  When I dropped off the car, was easy, you just need to remember which bus to take you to which terminal, I believe there are 4 seperate terminals.