I've ridden the Oregon coast twice. I did it first as part of a Seattle-to-Santa Cruz, west coast ride. I liked the Oregon coast so much I went back several years later and rode from Portland to Astoria, and down to Crescent City. I think it's a great place to tour. You meet tons of other bike tourers, the camping is wonderful - hiker/biker sites all along the route, and Oregon State Parks are pretty amazing anyway. There are lots of beautiful vistas, lots of amenities, and the weather in the summer was great both times. (I wouldn't start too late. Doing this route in a constant rain or drizzle would be miserable. My nephew did the west coast in October/November and had a lot of cold, wet days and nights. Brrrr. Yuck! But in mid-July or August it's usually really nice.

The first time I fell in with some guys who were only going as far as Brookings. They had called ahead and reserved some bike boxes at the local bike seller in Brookings (which I think was a hardware store in 1992; that may have changed.) They boxed up their bikes and sent them home. They got on a Greyhound bus in Brookings that took them back to Portland, where they flew out to their respective homes in Reno and Sacramento. I'm assuming Greyhound still runs there and you could do something similar?

When I did it the second time I rented a car in Crescent City and drove myself home to the central coast of California. I'm sure you could do the same and drive yourself back to wherever you left your car.

Consider buying "Bicycling the Pacific Coast" by Kirkendall/Spring. It's "the Bible" for that route. ACA also has a pacific coast route, and I'm sure their maps would be useful. But you could do just fine with just an Oregon bike map. All you really need to know is where the campgrounds are.