Thanks for all the replies! I wish I'd have gotten to this sooner since Bostom's suggestion of returning the car tonight and taking a cab to Logan sounds like the least stressful option. But too late for that now so we'll just wing it and hope for the best - we are finding that MSN/Google directions in Boston are not always as clear as one would hope for.

Friendly drivers! Yes, people are always waving to "go ahead make a left turn in front" of them on busy roads, stop to let pedestrians cross, things like that. Just doesn't happen in PHX. I also find in BOS people drive at sane speeds. In PHX they need to remind people that the 101 is the name of the freeway, not the speed limit on the freeway!

Thanks again.