Bayou Segnette State Park is a really good deal, and the location suits us perfectly. Not quite in the city, but not too far away. If you are coming there on a weekend, I recommend making reservations. When we left this morning there were only a handful of campers, by the time we got back this evening, the place was nearly full. It's quiet and well kept.
Should you stay there, I think the best way to get downtown is to go to Algiers Point and cross the river by ferry boat ($1 round trip!) into the center of New Orleans. We drove over today because we had some errands along the way, but we took the ferry back at no charge because they only charge on the Algiers Point side. Unbelievably (to me, anyway), there were only 4 vehicles on the ferry. Apparently, that's the norm for the off-season. There's a charge for parking on the Algiers Point side ($5 per day, $10 on Fridays & Saturdays). However, the privately owned parking lot is
not secure, and the attendants vanish before sunset. If you park and ride the ferry as a pedestrian or bicyclist, it's free.
However, if you're not too keen on city driving, and NOLA can be a bit confusing with many rough roads/streets, you may want to consider the
French Quarter RV Resort. It's right next to the French Quarter, and the St. Louis Cemetary No. 1. We drove by there today on the way to the FQ. It's pricey and, as any urban park, has a bit of a fortress look about it, but you'll save on downtown parking, which can be extreme in some locations. Today, we lucked into a free space today on Esplanade Ave. and Bourbon St.
French Quarter RV Resort - French Quarter RV Resort
Once you get downtown, The best way to get around, (unless you're into the organized tour bus thing), is to get an all day bus pass ($5) that you can use on both the trolley cars and the transit buses, which run all over the city.