having been there several times during this time of year, I would say have pants and a fleece to wear at night. It will seem cold. In fact, I have been there during this time when gloves on my hands would have been nice.
And, as you can see, I am from Maine. It gets cold here :wacko:
54 would seem like a heat wave right now and we would all be in shorts, but 54 in Florida at night with no sun, its chilly. And, really, there is nothing worse than being cold and miserable at the happiest place on earth.
And, as everyone else said. . .so jealous. . . enjoy your vacation!