Having fun for free with children

I once saw a documentary about healthy living but a comment on that show just stopped me. The documentarist said that children are very expensive and there is no activities you can do with children that doesn't cost money. Well, of course children cost money, you have to pay clothes and food. But there are many different things you can do almost free with kids. I have made a list some of the activities:
1. The first and the most to remember is that children appreciate the time you spent with them. No need to go to the Disneyland. Just the feeling that mom and dad are at home makes them feel safe.
2. Regular household activities together like cleaning (not when they are teenagers, you know what I mean), cooking, baking, gardening etc.
3. Having a picnic even on the front porch or nearest forest.
4. Reading books and listening music.
5. Dancing, playing indoor and outdoor games.
6. Arts and crafts, material collected from the nature.
7. Visiting in a library.
8. Exploring the nature
There are a lot more things to do, I just made up very quickly with a few.
In the past I interviewed people, over 80 years old, by asking them what is the biggest regret in their life? They all said the same:"Not spending enough time with a family."
Please, spend more time with your children and loved ones. Life is too short.