What are the best activities to do with a 9 year old that don't cost a lot of money?

Everyday I pick up my son from school and some days we can play ball outside or if it’s cold draw pictures inside, but mostly he just plays with toys or plays his videogames with the TV on until I make supper and end up having a nap before I go to work.
I’m just trying to think of some other indoor games or crafts or just something different I can do with him to give him a break from video games and TV until it gets warmer outside here in Canada.