That's a beautiful place to ride, and it was part of my journey on one of my early self-supported tours. While it's not as detailed as my more current journals, you might find some information in the journal from my 1999 tour in the Pacific Northwest.
I'd recommend ordering a copy of the Oregon Coast Bike Map. Info at http://www.oregon.gov/ODOT/HWY/BIKEPED/maps.shtml.
--- Denise