Hey Robyn,
I have the opposite problem, three kids and they are home in the afternoon and on weekends and vacations. Only one is old enough to be home alone. Did you register for the Flattest yet?
Hubby and I took a road trip last night (by car but don't tell) to see if we could ride from our house to the Blackstone Bikeway. We got lost in Woonsocket, RI but finally found the start of the path which isn't even really marked. By then it was dark.
By the way, I'm impressed, those hills in Harvard are killers.