Sunday is the last day of the French Quarter Festival, and I hope to touch down in time to catch some free jazz and maybe see the St. Louis Cathedral. Also, from 5-9pm at Tipitina's in Uptown (cab time, I suspect), there is a fais do-do, a Cajun/Zydeco dance. Poking around YouTube, this appears to either be a country line-dance sort of thing or, more traditionally, a combination of dances like the two-step and waltz. I don't know what's the standard at Tipitina's - I may call to find out. (I suspect I would be horribly embarrassed to fumble my way through a line dance, but can fake 1-2, 1-2, or 1-2-3, 1-2-3 all right, especially with a decent lead.)
I have a recommendation (via curiousangel) to try the Court of the Two Sisters for a meal. Perusing the New Orleans website has convinced me that I might want to hoof it over to Cafe du Monde for a cuppa coffee with chicory and a square doughnut. My eating options are otherwise unplanned.
I'm not sure what interesting things there are to do past 5pm on weeknights, past the "haunted tours" - kitschy, but perhaps not a bad way to see some interesting buildings and hear some local stories. I'll take a pass on Harrod's (gambling), I think. Of course, there's the live music all over the place. I could do worse than planning a rambling dinner menu (appetizer here, soup there, sandwich down the street) and listened to a bunch of jazz/blues/Cajun/Zydeco music.
Any other recommendations?