Since your 28 y/o guys, I'm assuming that you'll be spending quite a bit of time in the French Quarter. The police can be fairly tolerant, however, the moment that you start to infringe on someone else's good time, ..... Saw some a$$hole$ after the BCS eating asphalt on Bourbon St. with the Blue Shirts kneeling on their backs.
Buy plenty of BIG beads and have a good time. And, this is the rule: whether you like 'em, or not, if she shows 'em, you have to give her the beads.
One caution is that, each night, it would probably be a good idea for one of you to keep a level head. We've had an uptick in serious crime in the FQ and one of you might need to shepherd the others out of a bad situation. I know that I'm probably spitting in the wind with that advice.
I hope y'all have a great time and remember, what happens at Mardi Gras, makes for great stories when you're back home.
Hope you've made your hotel reservations already.