Cities are very walkable here. After the meetup yesterday, I went to the Vondelpark in Amsterdam just to wander about and enjoy the nature.
But trains are where I reflect most. I travel twice a week by train, the same route, and staring at the familiar terrain passing by is a great moment to reflect. When I walk around I still need to pay some attention to where I'm walking. Sitting in a train is a better environment for me to think.