The Tram tour narration is very informative and we got to see lot of wildlife. We spotted so many gators along the way. It takes 2 hrs for the tram tour and the tour runs every hour on the hour.
Note: There is an entrance fee to the Everglades Natl Park. Its good for 7 days and you can use it to enter the park from Florida City (SW Miami) on your way to Flamingo as well.