This viewpoint is easy to get to and offers amazing views of Mt. Hood.
The view from this spot is definitely worth the drive, if you're visiting Portland or the Columbia River Gorge area I highly recommend taking the time to stop here. Not a lot of people know about this spot and its likely you'll be the only person/people there!
If you get the chance, definitely come in the morning for sunrise! The valley gets very foggy and sunrise shots can be epic! Use a small aperture like f/9-f/20 to capture lots of details in your photo. Try and keep you ISO as low as possible and use a fast shutter speed. Depending on the time of day you may need to use a tripod if it starts getting too dark.
From Portland OR. take highway 26 East towards Mt. Hood, before you get to the town of Sandy OR, take a left on Bluff Rd. There is a pull-off for the viewpoint on the right side of the road for you to park.