Bank of America is offering free museum days (and other activities) for cardholders through their Museums on Us program. The program covers over 30 states and 150 museums.
"I'm not advocating buying a new car when you graduate (especially if you have student loans to pay off, or you're having a rough time catching on in today's job market), but if you do want to give yourself a graduation treat you should be aware that most of the major car makers offer some pretty superb cool graduate rebate programs on new vehicles. "