Thats kind of an open question :) You are right, dont go anywhere near an airport and dont go over people or vehicles, always use the rule that you will assume the drone will "fall out of the sky". So you are responsible 100% for any damage or accidents that happen. Imagine it landing on someone's head from 200 feet up You are responsible for it.
This website shows where you can NOT fly your drone. Go there and look around and pick any area that is not showing as restricted here.