The Columbia River Gorge lies just south of the Washington state line in Oregon. It is a beautiful corridor lined with waterfalls. The tallest is Multnomah Falls which has two tiers. Hiked up to the bridge that crosses the falls and offers nice vantage point to view the upper falls. Also hiked to several other falls in the gorge, but unfortunately had sunny skies so not many great photo ops.
On the drive leaving the gorge and headed to Olympic, you can see Mt St Helens and Mt Hood in the distance. Its cool driving around the Pacific Northwest and always having a snow capped volcanic peak like Mt Baker or Mt Rainier within view.