We stopped in D.C. and saw the monuments and the Air and Space Smithsonian Museum.
We went through Philadelphia and visited Independence Hall and the Liberty Bell - and got a parking ticket. We consider it a donation to the historic city. :)
While my dh was doing work in NJ - dd and I went over to the Atlantic Ocean and enjoyed several hours of beach fun.
On the way home dh wanted to go by his Alma mater - UNC in Chapel Hill. We drove by our first two homes as a married couple - and glad to say little had changed in 20+ years! Also glad we didn't stay on there for grad school - how different our lives might be today. It was a whirlwind and exciting trip.