As a teacher or educator, the classroom is your domain. You are in charge. You set the rules and the learning goals. Your children are close at hand, and under a close watch.
Once you leave the classroom, things change. You have less control. Children have more space, literally and metaphorically. So there is a shift in responsibilities. And this can feel frightening.
So why would you consider taking learning outside? And why would you give any thought to what children learn through free play?