I don't care for the pay-for tours, I like exploring things on my own/with a few friends but it's best to kinda/sorta stick with a group for the cemetery tours since they aren't in the best of neighborhoods.
I went to Tulane and spent most of my weekends-when not studying-exploring the historical sections of the city (I love the stories, legends, architecture, et al).
http://www.neworleansghosts.com/Ghosts.htm