If there are any seniors who are interested in going to college in Boston (seeing as there are so many!) Wednesday would be a good chance for them to see these universities. I know particularly Northeastern has "Engineering Wednesdays" for interested students.
The Museum of Science is Fantastic, but Faneuil Hall is also fun/historic. If the weather's nice, a boston Duck Tour really gives a great scope of things in ~1 hour.
PS I am SO STOKED for the boston regional this year
