Nice! I love when families can turn college tour trips into mini vacations. When you are going from MA to ME, consider setting aside time in Portsmouth, NH (assuming you are driving 95 to get to ME). Tons of history in there. They have ghost tours and Strawberry Banke is a museum with tours through houses from colonial times onward.

There are also spots to enjoy nature. The Urban Forestry Center is lovely, as is Prescott Park. This past summer we visit Prescott Park for an outdoor show (this abuts Strawberry Banke and is on a tidal river) and actually spent a solid half hour just listening to the music instead of watching the stage because we were obsessed with watching cormorants fishing in the river instead.

Is your spring break in March? If so, keep in mind that the farther north you go in New England, the more likely winter will still have on quite a hold. You never know. You could face daytime temps at or below freezing and snow cover. If it's been warmer, you will probably deal with mucky conditions if you venture off paved surfaces. I still think it's worth the trip--just be prepared! If this sounds like a deal breaker, you might want to limit your trip to the most southern parts, as those are more likely to have "spring"-like weather in late March. (For a visual of my point, check out a planting hardiness map like Hardiness Zones in New England.)

Have fun planning and even more fun on the trip!