My favorite route by far to run from the Cambridge house is the 5 miler I do down to the BU bridge and back.
It's not really a loop though, it's a turnaround. And it doesn't matter what mood I set out from the house in for it, I go knowing full well it will have turned around somehow by the time I get back.
Wednesday AM for instance I left the house feeling foul and hating that my bff called me into Agent action with a ring at 8am about the web episode filming job he was assisting on that morning because he threatened my being able to finish my 5 miles in time to sneak in a shower before setting up at my desk, but then I returned floating on air and feeling like life was a song.
This morning I left light as a feather and in a mood I could hardly imagine getting better until I came upon a wonderful College friend crossing River St on my way back, and if a 5 minute catch up chat with an old pal can't make you feel fortunate for your time in Boston, I don't know what can.