One nice thing about the Minuteman out to Lexington is that it's mostly (mildly) uphill the whole way. Thus, when you turn around at Lexington, the ride home is mostly (mildly) downhill, making for a nice finish. Lexington is the top of the hill, alas, so if you proceed out to Bedford, you'll have to climb back to Lexington. Still, the whole path makes for a pleasant ride.