Museums and Historical Sites
There is a wealth of activity to be found in the history department.
If you live near a major city, Washington D.C., Philly, New York (can you tell I'm an East Coaster?) there are museums which are inexpensive and oftentimes offer free admission for children of a certain age.
If you live near any battlefields or historical sites generally you can take a walking tour which is absolutely free and very interesting.
My family and I live near Gettysburg, PA and we went every Sunday to the town or the battlefields. We knew the area as well as our own backyard but it was always more exciting! Now as an adult I realize my love for history came from feeling personally connected to it while visiting Gettysburg.
A great way for your family to learn something together and save a few bucks. Who needs Chuck E Cheese when you can see what dress Martha Washington wore in the White House or stand where General Lee stood on a battlefield? Way more fun!