What are the possible best sites between New York City and Miami to visit?

What are the possible best sites between New York City and Miami to visit?

I'm plannig my first trip to the US and decided for the East Coast. I'd like to visit in 7 days all possible sites from NY down to Louisiana(New Orleans) and then to Miami where i'll fly back to Brazil.

Question about US East Coast

I really love all the southern states - they're so different from anywhere else... But the desert states are wonderful as well... 7 days isn't long!