This is a great idea and I agree more young people are loosing touch with nature and outdoor activities. One thing you could do is create a lesson where young learners have to start identifying biotic (living) and abiotic (not living) objects. For example a class could go outside and look and identify things that are living and non. A lot of children haven't thought of trees, grass and other plants as being alive and this is a great way to show them that living things are all around them.