I did a 3 hour bike tour with this guy
https://www.tripadvisor.com/Attracti...Louisiana.html and it was great. Loads of info. about Louisiana, New Orleans, Katrina, etc.. Doing bike tours is not his full time gig, however, so if you are unable to book a tour with him there are lots of other highly rated tour companies in New Orleans. However with the larger tour companies you never know which tour guide you'll end up with, presumably some guides are better than others. When you book w/ Big Easy you know you'll end up with Bob as he's the owner of the company and only employee.
Definitely stop by this place & order the BBQ Shrimp Po'boy
https://liuzzasnola.com/menu/ It's not really a traditional Po'boy, but it was possibly the best thing I ate during my stay in NOLA.
In between Bourbon Street and Jackson Square is a small grocery / deli called Veri Marte
https://www.tripadvisor.com/Restaura...Louisiana.html Their Shrimp Philly Po'Boy was damn good.
Since you mentioned music, here's your guide to live music while in NOLA:
https://www.wwoz.org/calendar/livewi...ate=2018-12-17
On Monday Dec. 17th George Porter Trio is playing @ The Maple Leaf, and Kermit Ruffin's is playing Treme Mother-in-Law's Lounge. You can't go wrong with either of those, though I'd go to the Leaf.
On Tuesday the 18th you've got lots of good options as well:
Rebirth Brass Band is playing @ The Maple Leaf (directly next door to The Maple Leaf is a great restaurant called Jacques Imos).
Treme Brass Band is playing @ DBA
Stanton Moore Trio is playing @ Snug Harbor
On the 19th this is the place you want to be:
http://www.tipitinas.com/calendar/pr...thday-tribute/