I agree the summer holidays are busy not just because of the US school hols but also the British school hols so bear in mind that it will be busy from aroung June to mid Sept

we have been June July and Feb
Feb was probably the best with regards to crowds but the weather was a bit on the milder side still not what we from good ol UK would call cold though
But I wouldnt be put off in June or July either though
I have to say that Florida is the bees knees whatever the time or crowd is like

Sarah