While most of Florida is straight roads, there are tons of country back roads that make for great road trip fodder.
Also if you ever do drive in FL, the roads west of Daytona in and around the Ocala National Forrest are gorgeous and some are even a bit curvy. There must be at least 10 corners in that area, which is more than probably the rest of FL combined when you exclude circular freeway onramps...
Also second North Carolina/Tennessee... Just beautiful up there all around.
I started a thread a while ago hoping to compile info on great roads in any state ... It didn't take off but while we're on the subject if you have ideas, feel free to add to that list!
http://bmwi.bimmerpost.com/forums/sh....php?t=1020117