Although perhaps a tad short on outright luxury, MIami has a decent selection of nice, down-to-business airport hotels, with runway views, pleasent (if not incredibly original) lobbies, and most importantly, plenty of power outlets and wifi. Plus, you can get way more bang for your buck at one of these places than over in Miami Beach.
First up, the Sofitel seeks to bring a french "ooh-la-la" to the airport hotel experience. Its tall, multi-level lobby has decorative flourishes here and there, a room tomorrow night will run $250, and that's during Winter Music Conference, where anything on the beach is totally booked up.
· Hotels Week coverage [Curbed Miami]