Go exploring for different colours and textures of soil. Layer them into an extra large jar with air holes in the lid and add some worms. Watch what happens next.
Share a photo of the most boring view out of a window that you can find. Can you then find someone who can find an even worse view?
Find rivers, valleys, bridges, sites of forts or rock towers just from hearing the name of a place.
Foxes, deer, sheep, and wheelie bins can all leave trails. Find one and track down its owner.
If you see red, shield your eyes, look irritated and walk in another direction.
Draw a picture of a continuous, 360 degree, view from under one or more trees in a park or wood.
Travel 100 metres without being seen.
Put identical containers outside in different places when it's raining... does one fill more than the other?
There are many different paths - choose one you have never taken before.
Go somewhere you (dis)like. Keep your ears, eyes and nose open... Which sounds, sights and smells are hardest to ignore?
Cross a place by walking, stepping, treading, pacing, striding, strutting, tiptoeing, tripping, skipping, dancing, leaping, lumbering, stamping, tramping, toddling, staggering, lurching, reeling,...
Speak to five people in a public place. Who is furthest from you and who is closest to you in terms of: where they live, their age, their taste in music and their opinions on something that's...
Become fascinated by what it would be like to explore as a tiny insect. Look inside the valleys, cliffs and canyons of cracked bark on trees and in other places. What curious things can you discover?
Go for a walk where there are lots of sounds and record the noises around you. Do the same walk again whilst listening to the recording you just made.
Hear and record sounds that would have been heard 100, 1000 or even 10,000 years ago.