(Mostly) Free and Fun Friday!

I love to scour around the internet and local publications for (mostly) free activities.  Last Friday my son and I went to library story time and then after we browsed in the children's section of the library.  We discovered puppets and a huge magnet board featuring a farm.  Afterward, we went outside to play at the playground.  We spent about an hour just hanging out and enjoying playing together.

Do you have a Free and Fun activity to share?