If you plan on staying overnight in New Orleans, we stayed at Pontchartrain Landing RV Park last summer and enjoyed our stay there. We had a waterfront site with an unobstructed view. We unhitched our tow vehicle and drove into New Orleans and I think it might have been a 5 minute drive or so from the park. We parked at a large parking lot not far from Cafe du Monde and had a nice time walking the area.
It seems to me that the park also offered a shuttle service, if I am not mistaken. You could
double check that if you like.
It seemed like an odd place for an RV park to be located because it is in a sort of industrial area. Once at the park though, it was quite nice. It had a nice pool and the park was clean, quiet and well kept. The landscaping was nice and there were some beautiful flowering shrubs at our site. I felt very secure there and our view was quite enjoyable. We were sorry that we were not able to stay for one more night. I would definitely go back again.