I don't know your area to give advise, but chances are that I'd ride the farmland alone. Though the poor drivers do sound scary. I'd make myself as visible as possible with a big triangle reflector strapped on my back and blinking LED lights even in daytime. What about putting your bike in your car and driving someplace with good scenery and where you'll feel safe? Or recruiting a training buddy, or even a friend with a car to shadow you the first time you go there.