Miami-what to do for about 5 hours before flight?

We are on Epic next week; flying in and out of FLL as it was so much cheaper. Our flight going home isn't until 5:15 so we decided to rent a car in Miami when we disembark and spend a little bit of time there before heading to FLL... Looking for some ideas for some must dos.... Landmarks, best shopping, etc.??? Thanks in advance !!!

Similar question just down the board:

http://boards.cruisecritic.com/showthread.php?t=2190527

We are on Epic next week; flying in and out of FLL as it was so much cheaper. Our flight going home isn't until 5:15 so we decided to rent a car in Miami when we disembark and spend a little bit of time there before heading to FLL... Looking for some ideas for some must dos.... Landmarks, best shopping, etc.??? Thanks in advance !!!

You can always go to TripAdvisor and type in Miami, and then click on things to do. Very extensive list.