Wow. Here is something I am putting on my decade-at-a-glance planner for a time when my kids are old enough to take care of themselves: The Peace Boat. It is a ship-tour of the world which came in response to some students unhappy revelation that Japanese textbooks did not tell the whole story of Japan's pre-war and WW2 interaction with its neighbors in Asia. So they went to those countries to collect stories first-hand.
Now you can go as a volunteer teaching English for three months. And the trip looks like this: