Which of these cities in the USA would you recommend?

So somewhere in between the middle to the end of next year I’m looking to take my mum to America. This will be my second time outside of Europe, and my mums first time ever. She is hard of walking and has a mobility scooter, she can walk but very slowly and not very far.

I’ve been considering far and wide my options and I think I need to reassess my plans. My absolute dream place is New Orleans and I’ve been trying to recreate that southern feel by looking for alternatives like San Antonio, Dallas and Houston. But I think I may need to reassess the plan. For information I’m planning on being in the USA for a total of 7-9 days.

My considerations are San Francisco, New York, Boston, Orlando, Chicago. They are easy flights from the UK and fairly good prices and non stop. I think it’s important to have an affordable direct flight for my mum.

I want to experience some real ‘American’ culture but not obviously overly touristy more authentic if that makes sense, cool bars/diners, comedy/theatre shows, music, live events, animals and consider anything that someone can do that uses a mobility scooter.

Thanks!