The most basic question is not what is best, but who shall decide what is best.
Claiming your 20s is one of the simplest, yet most transformative, things you can do for work, for love, for your happiness, maybe even for the world.
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.
Sustainability is not an option; it's a responsibility we owe to future generations.