The most vibrant areas of Atlanta, Charlotte, Phoenix, Houston, Dallas, Tampa, Orland

Other than disneyworld when i was 3 or 4 haven't been to any of these places. at least haven't visited. well stayed in charlotte for a day but dont remember and didnt explore. so what are the nightlife areas? I picked all these cuz they r prominent sunbelt cities. I'm in Orange County now but that's not a city and I know about LA. I've read about Buckhead in Atlanta.>