WA 20 is the best route. Too much traffic down on 2 and you avoid all the fruits and nuts out of Seattle by going 20... Too far for them to drive.
Winthrop on East end cute little old west type town with Great Ice Cream!
Lots of BLM campgrounds North Of Winthrop on HWY 1213.. where you don't need a reservation months in advance... Unlike 2.. where you can drive for hours looking for campsite last minute.
https://www.fs.usda.gov/recarea/okawen/recreation/camping-cabins/recarea/?recid=59073&actid=29Check out Harts Pass as well...
https://www.dangerousroads.org/north-america/usa/1853-harts-pass.html
