If you absolutely, positively must go to South Beach, leave your car in the municipal lot at 45th Street and Collins Avenue, then walk to the nearby Eden Roc or Fontainebleau, where you can grab a cab any hour of the day or night.(Aside from the airport, these are the only places in Miami-Dade where taxis line up ten deep.) Head to South Beach. At the end of the evening, cab it back. You won't spend half the night looking for parking, and you won't have to worry about tooling around under the influence. Now if we could all just stop going to South Beach.