Algiers Ferry, New Orleans
Absolutely free ferry for people (Cars are $1 roundtrip fare) from Algiers Point to the French Quarter area (right near Harrahs)
About every 30 minutes---great views of the city from the Algiers side----
The Algiers Ferry is a free transportation service provided by the City of New Orleans to transport you across the Mississippi to its historic Algiers neighborhood on the West Bank. You can ride your bike onto the boat and for $1.00 you can drive your car depending on which boat they use. It leaves approximately every half hour from either side. It starts running at 6am and stops at midnight.
This ferry provides routine service for cars and pedestrians between the foot of Canal St and the Algiers Point neighborhood across the Mississippi River. It's $1.00 per car from Algiers, but free from Canal St. For pedestrians, it's free.
I never actually took it, but if you're staying in the French Quarter or downtown New Orleans, and are going to Algiers, then give it a try.