Get your passport at the Joe Yenni building in Harahan
I've never had such an efficient experience in a government office. No line, three friendly employees ready and willing to help, and they even let my super vain teen choose which picture she wanted to use. We were in and out in 20 minutes. Totally worth the drive out there.
ETA: we did not walk out with a new passport, they simply processed the application and we'll get it in the mail. Sorry for any confusion.