Go out with a trash bag and collect trash. Turn the items into a piece of art and try to get it featured in your local newspaper as a way of demonstrating any problems of consumption and waste...
Explore your local stores and coffee shops. Which ones have the most sustainable products? Reward those that are good with a certificate and ask your local paper to list them.
Take a photograph of a 'blessing in disguise'.
Find a plant that is being damaged, hurt or restricted in some way. Write an email on its behalf to someone who might be able to help. Can you get it the help it needs?
Go somewhere you (dis)like. Keep your ears, eyes and nose open... Which sounds, sights and smells are hardest to ignore?
Find your favourite wild flower. Let it know how you feel about it.
Who can find and climb the lowest tree branch?
Cross a place by walking, stepping, treading, pacing, striding, strutting, tiptoeing, tripping, skipping, dancing, leaping, lumbering, stamping, tramping, toddling, staggering, lurching, reeling,...
Dance across a place in as many different ways as you can.
Visit a place. What most departs from the normal, breaks a rule or is out of place here? What is peculiar, irregular, abnormal, dirty or difficult?