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Another part is relative mass. We can float around in space because there are no atmospheric conditions and we are tiny in relation to the planet (similar to the difference between a bowling ball and a feather). This means, it is possible to truly conquer gravity by creating objects of large enough density in relation to the planet and whatever we're trying to 'float'.
I'd have to think we could create some sort of extremely low-energy vehicle in this manner (maybe some kind of train-like system or possibly a system enabling vehicles to roll both toward and away from the core of the planet).
In addition to vehicles, we could likely create environment-friendly energy machines.
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