While the scenery on the Olympic Peninsula would have been to die for from a car or motorcycle, I found the riding to be too stressful. Ngateguy is entirely right about coal trucks and one should keep in mind that, when on the peninsula, 101 is the main artery for every local, tourist, or industry. The shoulder is decent but filled with cracked up bottles, trash, and at times is nonexistent. Now, I've only done the Hood Canal side, so I can't say much for the ocean side, but I don't see how it could be much different. What I would recomend is traveling through the islands of Puget Sound. Whidby has some of the best biking I've seen anywhere and Vashon is one of the more pleasent places on Earth to me. Granted it might take a little longer and there is the added cost of traveling the ferries (which, to me, is a pleasure in itself) but I think you'd find the experience well worth it. Also, the only time to do this is in July/August- doing it any other time is short-changing yourself.