Hey Ryan:
You're right about non-cyclists, but that road isn't too good. I've ridden it a couple times with my son on bike camping trips, when he was 10 and 11. He's a very experienced cyclist for his age, but that road was probably the second or third worst part of the trip (which went from Tacoma to Manchester, then Northwest to Port Townsend, and onwards..actually, IIRC, the easternmost part of that road was pretty nice, but it wasn't so good as it got closer to the passenger ferry.The passenger ferry, however, is really nice) What about approaching Manchester (which is great) via Southworth ferry? I assume your son will be in a trailer, or on a trail-a-bike? When I think about it, I guess the road you show is ok for that purpose, since you're doing the steering. I never felt in danger, even with my son. It was just a little trafficky. The part which cuts over to Manchester is pretty nice and there are, strangely, some camels in the middle of a field just north of Manchester?!
Have fun
Art
Tacoma