Sorry that I didn't answer sooner. Been a little crazy around here I don't have a clue what one might do in Boston at that hour of the morning. None of the usual tourist haunts would be open. I guess you could go downtown and just walk around, maybe go to Cambridge and walk around Harvard Yard (which would be open), maybe get some breakfast down by the water or over at Fanueil Hall. Not much to do that early. Sorry.