We cycled around the Olympic Peninsula last summer during June, almost peak season. It rained every day. There were very few cyclists (we saw one going in the opposite direction) and the towns are few and far between. There are some narrow stretches of road where the fog can be quite thick (see the photo below where they have a special blinker light warning drivers of cyclists on the road) and the loggers are everywhere, but they are not as rabid as I expected and would often move to the far side of the road to avoid us.

That said, there are some beautiful places Quinault Rain Forrest is spectacular and lives up to it's name. Kalalock (where Amanda is stretching in the sun) was a wonderful campsite overlooking the beach.

But without a car it is difficult (though many have done it) when doing a continuous tour to cycle up into the Olympic Park then back to the highway, or down to the coast and back. It may just be me but cycling out and back by the same route is psychologically difficult.