One thing we had planned, since we were in NOLA for Mardi Gras season, if not the day, was to take in a few parades. In the interest of full disclosure, I am uncomfortable standing for long periods of time, and I don't think my parents would enjoy it too much either. But, you can buy tickets to sit in a viewing stand, with seats and access to port-a-potties, so you can be comfortable and watch the parades. We bought tickets for Hermes, Krewe d'Etat and I can't remember the last one, to be honest. It was cold, the parades were late, so we didn't make it to the last one. We were still there over four and a half hours, so I think we did fine.
We made lots of "Stand Buddies". Everyone was very friendly. The only thing we found was you have to be careful when they are throwing things. Heavy beads can leave quite a bruise on your forehead.
We would definitely want to do this again, although, we would bring warmer clothes and hope for better weather.