Do Skyline to Germantown and take Leif Erikson back instead of HWY 30. Warning, Leif Erikson can be very cobbly, I almost want a full suspension on it sometimes. Its one way to guarantee you won't see a car for 10 miles, and Skyline isn't too bad either! (Views at least, but I havn't had a car problem early in the morning).
If you start in Beaverton you climb to Skyline, end up in NW Portland, and get to climb Vista to get home. Adds another nice climb