Have a go at making your own Magic Rainbow Milk. Kids of all ages will love it! Magic Rainbow Milk is cheap, quick and easy to set up and if you do it outside (highly recommended!), theres not too much mess to clean up afterwards.
OK a bit messy, but lots of fun! Make your own edible finger paint for the kids. Its cheap to make and safe to use and if theres any left over, store it in the fridge or freezer to use for another day.
With perhaps a little help from you, kids will have lots of fun making their own recycled robots with items you're recycling or already have around the house. Making recycled robots teaches kids about recycling every day items and giving them another purpose, instead of just throwing them away. It is also a great activity for using their imagination, concentration and problem solving skills.