Two more things - the airport hotel *is* very 70's. But last time a friend stayed there - it was - like I said - decent and clean - and quiet (good soundproofing). I'm sure there are better places to stay - but if you have an early morning flight out of MIA - it's nice not having to glue your ear to traffic reports at 6 am.
Also for BamaVol - the rail line only goes to downtown Miami - not Miami Beach. The only public transportation to Miami Beach is the bus - and you don't even want to try doing that during the day - much less at night. So your options are renting a car - or taking a cab. I don't recommend a car rental if you'll be clubbing all night (renting a car and parking it on South Beach isn't cheap - and you don't want to worry about dealing with DUI enforcement - which can be quite strict). Robyn