I'm from New Zealand and know nothing about U.S driving routes. I plan to drive a two week round trip from San Fran up to Seattle at the start of September and would want to do some sort of loop so as not to backtrack so effectively need two itineraries of interest. The only things that I need to work in are Portland for three nights and Seattle for three nights, the rest is flexible so I have 4 nights roughly in each direction to fill.
What would be a good way to achieve this?
Thanks for your help.