Thanks everyone for all the good wishes!
We have toured a few colleges already - Ohio State, Syracuse, Univ of Connecticut, Boston Univ, NorthEastern Univ, Univ of Massachusetts-Amherst. We're specifically going to see Univ of Maryland, Univ of Delaware and Villa Nova. DS would like a large school and would love a big sports program (spectator). He's thinking about majoring in computer engineering. His top picks right now are Northeastern and Ohio State (both DH and I are alumni). So we figure once he sees the next 3 on this trip, he'll have plenty to choose from. DH and I will take turns doing the college tours so we don't have to drag the other boys with us.
I have planned this trip almost like Disney - trying to pack lots of sight-seeing into the few days we have. It will be busy but fun and interesting and hopefully not too expensive! It's amazing how most things in DC are free (museums, zoo, monuments, etc) and we're staying at my cousin's condo which saved HUGE amounts on hotels.