I feel truly free when I am traveling. The means don't really matter, whether it's an airplane, a cruise, a bus or my own car. As long as I am going somewhere that is different in it's culture, scenery, development, people, or land.
The feeling of displacement and constant change are a breath of fresh air to me. I often enjoy the trip more than I enjoy the place I am going to. In other words, I like going somewhere more than being somewhere.
The idea of being able to be somewhere if I wish to gives me a priceless sense of freedom.