my commute is about 15 miles, only 5 of those is on busy streets but the rest rolls through a nice town, and along a multi-use riverpath for a good bit of the distance.
on the way home i roll through about 5-6 miles of crushed gravel road right through the middle of a park (if it is dry). it is beautiful...
my commute is basically downhill in the morning and in the afternoon i got lots of hills i can alternate on if i am feeling good (i have to climb one but if i want i can hit 2 or 3).
it is a great commute. if i could alter it i would take a little more city riding to "get the juices flowing" but i am not complaining.