If you go onto google maps and set the directions to "walking" it gives you 3 different routes. Here see if this link is of any help
http://maps.google.com/maps?f=d&source=s_d&saddr=Berkeley,+California&daddr=Medford,+OR&hl=en&geocode=FV7iQQIdDVW2-A%3B&mra=ls&dirflg=w&sll=40.094882,-122.409668&sspn=7.678909,14.128418&ie=UTF8&ll=40.094882,-122.080078&spn=7.678909,14.128418&z=6&layer=c&pw=2
GOOD LUCK!!!!
If you want to ride the coast, go the other direction (north to south). The shoulders on the coastal side (southbound) are wider than on the northbound side. Another thing that anyone who has ridden along the coast of California and Oregon can attest to is that there really is no such thing as a 'true' tailwind. You'll get it from all sides within feet.
Otherwise the Google map suggestion might be your best bet. There are tons of little side roads that will get you from Berkeley north. Just be prepared to climb a lot. It is not flat at all.
Most of all enjoy your trip!
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