For those that have visited before, or live in Boston, how easy is it to get around by foot (I don't drive) in the harbor area? Any places I should definitely visit? A friend works up there, but he will be gone two of the four days I'm there, so I only have access to rides for part of the time. Is there a bus or metro/subway system I could use?
Recommended cheap hotels nearby? And I mean the cheapest of the cheap.