Not a tourist spot, just really good food.
A ride on the St. Charles streetcar to the end of the route and back downtown is only $1.25 exact change each way, and it is the #1 thing I suggest to visitors. This route takes you past some of the most beautiful mansions and oak lined streets of New Orleans. You can also get a day pass for the streetcar that works on the buses as well.
Magazine St. is Main Street USA in true NOLA style, offering 6 miles of intermittent shopping and dining. While you will find a few national brands, locally owned is the norm. Unique boutiques, top chefs, art studios and markets have been popping up along this exceptional thoroughfare since the early days of New Orleans. Some of these family owned shops are closed on Sundays, so be sure to check their hours.
There are plenty of locations, but they will all get you the same sugary goodness.