I have never been asked for FL ID - sad, isn't it?!! I'm always ready to drag out the old license, but... Typically ID forms are licenses, state ID cards, university ID's, utility bills, voter registration cards, etc.
For the past year or so there've been FL resident discounts most of the time. They typically come out around the same time as the AP rates. They are usually a bit cheaper than the AP rates - particularly at the value and moderate resorts. We stayed at CBR this summer for $85 which was really good.