PaxTrax in Bunnell, FL. Never actually rode on it, just walked it a few years back and I think its the same since. Another place is WW Ranch. Not sure if its open yet or not.
Waldo is pretty good. Open 7 days a week. Big track and pee wee track too. Probably good for only one day of riding as its not that difficult skill wise.
Bartow is nice. Open 7 days a week. Two tracks a supercross and an "outdoor".
They combine the two for practice and its pretty nice. Big jumps and lots of sand.
Waldo and Pax. hardrock is....well...hard.....and takes a toll on your tires! Pax is just super fun. Waldo is sweet too. Not far from Gainesville. But its the speed trap capital of the south! Don't speed around Waldo! They'll nab you.