What to do in Boston

I’m sure some of you know that I attend an art school in Boston, but due to a few reasons I’m transferring to a different art school in Seattle here soon. For those of you non United States-erians that basically means a coast to coast move on a similar latitude. I only have a month or so left in Boston, so I’m asking those of you Bostonians what do I absolutely need to experience while I still in Boston that I would regret never doing/seeing/eating/mugging while here.

Suggestions suggestions suggestions please!