Mt Hood and the Columbia River Gorge are not far at all from Portland Oregon. If you were to take the whole day, you could experience a good portion of both.
Following highway 84 east from Portland will put you into the gorge fairly quickly. With one of my favorite spots in the picture above about 30 minutes outside of Portland. The view tower is usually a fairly popular spot to stop and get a good look. Don’t expect to be alone, as it is usually crawling with viewers and picture takers.