5. Spend a year (or two (or three)) abroad

I think everyone should spend a year (or two, or more) away from the country of birth (or of growing-up). It broadens one's horizons, and lends a perspective that would otherwise be difficult to achieve.

Ideally, this should be to a place where the language and culture are different from those you are used to.

At one time, I could claim that I lived in Japan longer than I lived here in the USA. (Alas, this is no longer the case). Still, I would like to spend a year in various great cities of the world: Paris, Rome, Berlin, Prague... Doing that was a dream once. And still a possibility.