Make a map that can be given to kids who are new to your area.
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...
Go on a journey with a friend and make a journey stick to help you tell the story of your adventure when you get back.
Find some dead minibeasts and magnify them as much as you can on a microscope/photocopier/scanner/camera/telescope or other device.
Photograph places where the 'wild' is taking over from 'civilisation'.
Save an apple from going brown and yucky!
Make it feel like you are experiencing déjà vu
Take a picture of a duck under the 106 here.
Walk (or drive or cycle) between one neighborhood and the next. When do you know that you’ve definitely moved from one to the other?
Create Land Art from natural things you can find on the beach.