...with your family.
First, step away from the TV! There are much more exciting things to do. Also, you won't have to watch adverts that make you want more and more STUFF.
Do some colouring together. I don't know about you, but when I was a child I used to love colouring in pictures. You can print some lovely colouring pages from the Internet, from children's characters to beautiful, intricate designs. Sitting and colouring together can be a lovely time to have a chat, relax together and bond with your child.
Build a fort/castle/den. Remember when you were a child how much fun it was to construct a hiding place out of furniture, blankets and boxes? Join in with your children and build one now! It can be as simple or as elaborate as you like. Add a torch and a snack, and you have doubled the fun!
Fly a kite. If you have one already, then use that. If not, google instructions and you will find lots of simple tutorials showing you how to make a simple kite out of stuff you probably already have around the house.
Make some nature wall art. Go for a walk together and gather leaves, sticks, grasses...whatever catches your eye. Take them home and use them to put together some art. Perhaps you could make a decorative wreath, or a collage of some kind.