In many cities, public transport is simply how you get between attractions. In New Orleans, the streetcar can become an attraction itself.
See the city at street level
Streetcar routes connect different parts of New Orleans and offer a wonderfully slow way to watch neighborhoods change outside the window. The historic St. Charles line is particularly associated with the classic streetcar experience.
Do not treat it like a tour bus
Streetcars are real public transport used by residents. Give people space, be ready for your stop and avoid blocking doors while trying to get the perfect photograph.
Check current fares and service
Routes, fares, payment options and disruptions can change. Look at current information from the local transit authority before setting out rather than relying on an old travel guide.
Enjoy the journey
I would deliberately build one streetcar ride into a New Orleans itinerary even if another form of transport might occasionally be faster.
Ride toward the Garden District, watch the city roll past and get off when somewhere looks interesting. It is inexpensive sightseeing in spirit and one of the simplest ways to experience New Orleans at a more human pace.