Travel to live in crazy places. It will educate your mind in ways that nothing else will. I mean places like Burma, Niger, or Antarctica. London and Paris will still be there in 20 years when you want a more leisure pace. 

Pay great attention when selecting your life partner. Most important decision in your life, think "do I want to be with this person in 50years and smell their feet and farts all this time?" If the answer is not a resounding YES, then pass. A lot of people settle for second class. Don't.