Here's a few tips on how to be reasonable and prudent yourself.
Stay at or under posted limits in the cities. Even late at night with little traffic, stay close to those limits. There is a lot more things that can happen on one of those streets than a major highway.
Stay at the limit the first time you go over a country area road. Once you know the twists and turns and what to expect, then you will be more comfortable going faster, and still be safer then you were the first few times you took that road.
Watch your highway speeds and be alert. Never exceed a speed where you do not feel in control of your car.