On September 23, Smithsonian Magazine will offer free general admission for two people to select museums when you register for Museum Day Live!. (Fill out the short form for your tickets.) That's the best deal we've seen for this many museums since this same event last year. More than 1,000 museums across the U.S. are participating. Click here to find a participating museum near you. A limit of one museum visit for two people per household applies.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.