Bowling has an interesting history. I've shared before about Martin Luther's role!
There are two programs that provide 2 free games of bowling everyday for kids all through the summer.
AMF Summer Unplugged Free Bowling--One nice thing about this program is that it also offers a discount summer pass, so parents can also participate.
Kids Bowl Free--Various bowling centers around the US and Canada.
You still have to pay for shoe rental with both programs.