If you don't live right in the city, the Metrorail system is the easiest way to get downtown. The Metrorail is an elevated train system that runs from Dadeland Mall up to Hialeah and Okeechobee. This is a great option for going into town for high-traffic events and concerts.
At Government Center, the Metrorail links to the Metromover. The Metromover runs in a loop around the city with stops near all major points of interest, as well as a north branch to the Omni Shopping Center and a south branch to the financial district. A similar Light Rail project for Miami Beach is on the planning board.
Miami-Dade also has a Metrobus system that thoroughly covers the county from southern Broward County to Key Largo, and from Miami Beach to west Miami-Dade. With over 600 buses and 82 routes, it connects to both the Metrorail and Metromover. Expansions are in the works for Kendall and South Miami-Dade.
If you really want to travel away from the city, there's the Tri-Rail system. The Tri-Rail runs from the airport as far north as West Palm Beach and Mangonia Park. If you want to take a day trip into Boca Raton without the stress of driving the turnpike, Tri-Rail will give you that extra time to relax. There is an intersection with the Metrorail north of the city.
Whatever your travel needs within Dade County, there's a public transportation solution. Take a day to explore all that our city has to offer!