I was visiting the Portland area on business during which a few of the Portland locals recommended I take a few hours at the end of my day to visit the falls. Certainly, I cannot thank them enough, as I believe that this spot is one of the most beautiful spots in the Portland area.
The hike is along a paved walkway until you reach the top of the hanging valley above the falls. Multiple switchbacks provide a quick climb and views of the Columbia River Gorge (as well as multiple views of the falls along the way)so be sure to bring your camera.
The falls are well visited and well loved, so don't anticipate getting away from the madding crowds, unless you visit during the week, or as I did, late in the day.
At the top of the falls, the trail leads to other areas worth exploring as well as a well constructed platform that offers dizzying views OVER the edge down the lodge and parking area.
If you're in the Portland area and don't make a point to visit Multnomah Falls, shame on you...you're missing out on a memory worth making.
Oh yeah, take your camera, you'll be glad you did and will kick yourself if you don't. That being said, the well stocked gift shop at the lodge will sell you one, just in case.
The restaurant at the Lodge is not too bad. Avoid the lamb, it was a little chewy. The salmon was excellent.