Children have a natural tendency to explore, to learn what they need to learn. Nature provides limitless opportunities for children (and adults) of all ages to explore, play, and learn.
Cruising baby, with a soft surface to land on:

Learning about teamwork (drilling) and sharing a favored stick.

Entomology
Nature photography – E’s photographs using a knarled stick as a camera holder and grass-cutter, revealing the tiny bugs living under tall grasses. 
Nature offers a right-sized physical challenge for any age:

