This video from George Monbiot at the Guardian is one I am thoughtful of. George makes a passionate case for outdoor education. And I agree with him, outdoor education is an important thing; essential actually.
Certainly, I was bought up on a farm and enjoyed my time outdoors. Later on I was an active tramper and climber, this was an important part of my life. Now-days my efforts extend to brief stints gardening and my time biking to work. And I love that I can sit outside in the morning and watch the sunrise accompanied by the chorus of the local birds.
But my thoughts on the class room complicate the story; I enjoyed school, especially science class, and so much of my time now is curiosity on the internet. That is fun too. And I have vividly pleasurable memories of my time as a postgraduate chemistry student.
For what is is worth, I think children and adults thrive outdoors; and indoors too. The quality of engagement is the thing. Passion and curiosity, leading to growth. And I agree with George, providing rich experience for children must happen.