Miami's best day trips are closer than almost anyone expects, and the famous one is much further than the marketing implies. Everglades National Park, the largest subtropical wilderness in the United States, starts about 25 miles west of downtown along the Tamiami Trail: under an hour door to door, and you can be watching alligators from a paved path before the hotel has finished serving breakfast. Biscayne National Park, which is roughly 95 per cent water, has its visitor centre about 50 minutes south near Homestead. Two national parks, both inside an hour, and most visitors leave without seeing either.
Key West, meanwhile, is 160 miles away down a two-lane highway with 42 bridges on it. The coach day trips are honest about the schedule if you read carefully: about three and a half hours each way, six or seven hours on the island, and a fifteen-hour day in total. People do it and enjoy it. People also do it and spend the return leg wondering what happened to their Tuesday.
In between sits the rest of the Upper Keys, which is where the day trip actually works. Key Largo is an hour to an hour and a quarter from central Miami, and it holds John Pennekamp Coral Reef State Park, the first undersea park established in the United States, with reef snorkelling six miles offshore. Islamorada is another half hour. Both give you a genuine Keys day without seven hours in a vehicle.
Going north is the underrated direction. Brightline runs from MiamiCentral downtown to Fort Lauderdale in around half an hour and West Palm Beach in a bit over an hour, with advance fares that start low and no car, no parking and no traffic involved. It is the one day trip from Miami that is more relaxing than staying put.
What follows is each option with the drive time stated plainly, the season that suits it, and what it costs. The rule underneath all of them: leave before 7am or after 9:30am, because Miami's rush hour will take an hour off your day before you have left the county.