Every year The Smithsonian sponsors a free museum day and my kids and I take FULL advantage.  We've been to the children's museums, history museums and any other place they wanted to check out.  Culture with no high price tag, or any.  Click on the link to find the full list of museums that are free tomorrow, Saturday the 29th, in our area...

http://www.smithsonianmag.com/museumday/?utm_source=direct&utm_medium=printmagazine&utm_campaign=2012-July-August&utm_content=museumdaylive