Sure thing! Sat or Sun? Sunup's like 6:30 - earlier is better due to the city traffic thing.
Warning: a few 3-mile stretches are kind of car-ugly.
Being as how it's an intro ride, we might just call it "no-drop to the road junction." As intro rides go I'd like to set it up as friendly. If someone's dying, we might find 'em a good coffee shop and shortcut route out of there. Hills are always free-for-all because we'd hate to break a climber's spirit on a freeway overpass, ya know?
That said, 15-20 is good. I'm not inclined to be a regulator but leaving people for dead is bad form