You may find yourself wanting to come back for a longer stay!! If you travel US 50 (The lonliest Hwy in America) you will find a lot of caches & a lot of history. NN has quite a few ghost towns, cemetaries, a RailRoad, mines, etc.. There is a US Hwy 50 Route (from AZ to ID), also a US Hwy 6, both by Longwalker. Look up Cache "Ghost Train of Old Ely" both routes are bookmarked here.
There is a Ghost town Atlas available (Published by Cy Johnson & Son, Susanville, CA) for CA & NV that points out places of interest & has hand-drawn maps of both states. A very helpful book, I've used it for years on my various adventures! Maybe there are some for OR & ID, also
http://zip4.usps.com/zip4/citytown.jsp is the address I use to look up all of my zips, just plug in a town name & it will give you a zip for a cache search of where you will be going.
Looks like you have a great vacation planned have fun! [Am jealous ]