there are trails all along state road 40 that don't cost a dime to be on. i've been in DC for a while so i have no idea how much rain they have had... so things could be wet and starting to get overgrown. i wouldn't recommend going out there alone -- or without at least letting someone know exactly what trails you're planning to run.
if you wanted something more controlled. the hardrock ORV is in ocala. it's 25 bucks to play - and if you get into trouble you can call the office and they'll come extract you..
your stock rig is capable of quite a bit... you'll be surprised.