Go slow whenever you can. I see people pounding through the airport to get to the counter, customs, lounge, security, etc. Slower is always better. Give yourself the gift of time every chance you get.
Adapt to loneliness. Foreign countries particularly where English is not widely spoken can create a sense of isolation. I tend to be quite comfortable on my own but colleagues often struggled with loneliness while travelling.
Be self-contained and ready to leave at a moments notice especially in developing countries. I always carry my passport on me, have sufficient cash to get to the nearest airport and room on my credit card to cover a walk-on fare anywhere in the world.