Not sure how much time you have but these are some places that would fun to see. I lived there for 28 years so any questions you have I'd be happy to answer.
I don't know your route but you should get a view of the Snake River and then the Columbia River. Plenty of areas for picture taking.
Once in the gorge you can drive over Mt. Hood and into Portland. It's longer but more scenic.
Multnomah Falls,Columbia, Gorge Mt. Hood
In Portland: Japanese Garden, and the Rose Gardens, Zoo
The coast: Canon Beach or Lincoln City, Tillamook.
Have fun and take lots of pictures!!
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