I am so jealous...I am not visiting Florida this New Years due to schedule conflicts. I usually vacation farther up the Gulf Coast, but I am assuming the fishing down there should be awesome.
Anyway, I would bring four setups: Decent fly-rod; Light (6-10) spinning; Med Spinning (20-30); and a heavy Spinning or Conventional (80-100). That should give you a chance a basically everything that swims (within reason).
I would also bring along a cast-net, some sort of bait-well, waders (if its cold), boga grip (everything has teeth), lots of fluorocarbon leader material in appropriate strengths, terminal tackle, etc.
Good luck...wish I was going with you!