Been a dozen times.
Bourbon is fun, but check out Frenchman street right next to the French Quarter, where the locals go and great live music.
Lord Chaz Haunted tour is a must if you are into campy fun haunted tours. its 2 hours, starts in a bar, breaks in a bar after an hour and ends in a bar. Lots of fun, over the top on purpose, but also accurate real haunted history
Get a Hurricane at Cats Meow, last time I was 32oz for $8, insane.
Get a Hand Grenade at Tropical Isle, very strung but yummy drink with cool souvenir glass.
A tour of a grave yard is fun, really depends on how long you have.
WWII museum is amazing, taking a ride to Garden District on a trolley is fun, tons of restaurants, you can use google to find good ones like Acme Oyster Bar, or so many others.
Like I said, been a ton