Trying to go to the "it" clubs
South Beach is a shallow, terrible place. Now that we've established that, here are some warnings about going to those big sexy clubs you see on TV.
If you're a group of guys, your chances of getting into a club without buying a bottle are a blip. Unless you're prepared to drop literally thousands of dollars on bottle service, getting in is going to be tough, and even then there's no guarantee. A very wealthy friend of mine was planning a bachelor party here and called LIV to try and reserve a table for 12 guys. They hung up on him before even quoting a price. Have attractive girls with your group, or don't even try.
If you're a group of girls your odds are better, but if you're not a certain definition of hot, you're never getting in. Or, worse, a doorman will point to three of you and say, "You three can come in. The rest… hell no!" This actually happens. Nightly.
Either plan ahead through a promoter, or be prepared to wait outside for a very, very long time. Getting there early (like before midnight) helps too, but if you don't look the part or have the money, you might wait out there all night.
Flying into Fort Lauderdale (FLL)
Miamians love nothing more than that friend who says, "Hey, can you pick me up at the airport Friday morning?" and then ever-so-conveniently texts, as they're boarding the plane, "You know I'm flying into FLL right?"
You might get all giddy because you saved $75 by flying into Fort Lauderdale instead of Miami. Easy there Turbo, it's still gonna cost you. A cab from FLL to South Beach will run $100 each way, while Uber or Lyft is about $50-$60. If you arrive during rush hour (7-10am on weekdays) that can triple, and you'll spend the first two hours of your vacation in traffic. Even without traffic, that drive is 45 minutes.
"Oh, but I see there's a train!" you say. Technically, yes, the Tri-Rail has a stop called "Ft. Lauderdale Airport." It's about a 15-minute shuttle ride away, followed by a 45-minute train ride to MIA and another 40-minute bus ride to South Beach. Point is, if you value your time (and in some cases your money), save yourself the hassle and fly directly into Miami. Your local friends will thank you.