On vacation go to the most remote place on your itinerary first, bypassing the cities. You‘ll maximize the shock of otherness in the remote, and then later you’ll welcome the familiar comforts of a city on the way back.
And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.