It sounds like you will mostly be on the West side of the state. Plenty to do and see.
Near the Sea Lions cave/near Florence (so going up towards Astoria) there was a charming little botanical garden. Usually that is just a walk with trees and names like "Douglas Fir" but this park is a good stretch your legs if not a full destination.
https://oregonstateparks.org/index.c...Page&parkId=81
Basically it's a board walk through a carnivorous plant swamp! It was fascinating.
I guess the Tillamook cheese factory is no longer open to visitors. However, I highly recommend their products and especially the ice cream! Tillamook is an area in Oregon.
https://visittheoregoncoast.com/cities/tillamook/
Portland has one of the first of the modern donut shops, Voodoo donuts. They've been featured on the Food Network and Travel Channels
https://www.voodoodoughnut.com/
As I mentioned before, the general Portland area is the home to many amazing gardens and nurseries. Lots of places to go and take a moment of peace...
https://www.thecrazytourist.com/top-...o-in-portland/