On September 30, 2006, for one day only, museums across the country will join the Smithsonian Institution in its long-standing tradition of offering free admission to visitors.
That's tomorrow, of course. You can print a pass for one time use on September 30, 2006.
To get a list of partcipating museums near you, see this link. If I can make it after class, I think I'd like to see The Bunny Museum.