First of all, Southerners won't even consider Florida as a southern state 😊 The rule of thumb is that the northern you are in Florida, the southern feeling you would get. Up north till you cross the state border to Georgia.
Keep in mind that across the Bible-belt States (the Carolinas to Louisiana), alcohol sales might be different from the rest of the continent. State of Georgia does not sell alcohol on Sundays, and I think Alabama and Tennessee have the same rule.
Ditto on passport photocopies, nobody will accept that here. And I agree with everybody else's opinions about Driver's License etc.
Talking about American culture, especially in the South ...
It depends on what time of the year you will be here, but if it is during the college football season (in the fall - August till November), it is worthed to check out big universities in the South that are HUGE into American Football - University of Georgia, Clemson University, Auburn University, Louisiana State University, University of Florida to name a few ... now, then you will find all those hot partying college chicks there and will experience many things about Southern USA culture - tailgating, Greek houses (frat parties, anyone?), porch chilling, fried chicken and cold beer, catfish.
I am a very healty person and I don't smoke or drugs, so I have no clue on the marijuana question.
Good luck in traveling the South - and don't forget to visit us here in Atlanta, the birthplace of Coca-Cola, CNN and Gone with the Wind. And I don't believe we have any negative Scandinavian stereotypical - except y'all are blond, drink Vodka and look Viking-ish ... and yes, the opening of an IKEA store in Atlanta helps to promote the sister cities effort 😊