We've stayed in Miami on several occasions but only one nighters to allow for adaptation from a long haul flight to driving somewhere else. I'm not particularly excited by Art Deco architecture so didn't really pay much attention to it. Stayed one night in South Beach, wouldn't recommend it. I intended to visit the Wynwood Walls but then read a lot of comments about the serious crime problem, I took it with a pinch of salt, imagining the sort of exageration crime in Europe is given on travel sites but when I looked into the crime statistics it appeared the advice was true, I didn't fancy being robbed at gunpoint so I didn't visit.
Our last visit we stayed close to the airport as we had no desire to explore Miami. I asked the hotel concierge if there was somewhere nearby within walking distance that I could buy a bottle of wine and some snacks for the kids and he looked at me as if I was crazy. He said there was one within driving distance but he advised against walking as it was too far. However by the way he described the route it sounded doable so I set off. It was a 15 minute walk! OK, it was mid August and I built up a bit of a sweat but honestly, you'd think it was a 5 mile hike the way he reacted. The area where the store was located was a bit rough and there was a palpable sense of tension from the many dodgy looking characters hanging around and this was the general feeling I got from much of Miami. Obviously there are some parts that aren't like that but when you feel like you have to be on your guard for much of the time it doesn't make for a particularly enjoyable stay.
We loved the Everglades and the most enjoyable way to explore a tiny part of it is by airboat. There are many, many airboat companies offering tours, I have no idea who we did our tour with but I wouldn't recommend him. There were several large fires amongst the reed beds caused by lightning the previous night and he took us through these fires along the water channels despite my protestations (we had our two young children with us at the time), he thought it was safe, I disagreed. Other than that bit of recklessness the rest of the ride was great fun.
In contrast we found Fort Lauderdale, Pompano Beach and West Palm Beach to be more pleasant to visit than Miami. Miami just felt overly seedy and troublesome for my liking however I know plenty of people love the place but I would find five days too long.