Multnomah Falls

Roughly 30 miles east of Portland along the Columbia River Gorge is one of Oregon's iconic symbols – Multnomah Falls, the tallest waterfall in the state. The water actually falls in two stages, so there are technically two waterfalls.
There's a small bridge – the Benson Footbridge – that spans the top of the second waterfall, and offers an excellent view of the taller of the two waterfalls. There are lots of great hiking trails in the Columbia River Gorge, and some start nearby – including the Mark O. Hatfield Memorial Trail.
At the base of the falls is the Multnomah Falls Lodge, which has a restaurant, some snack vendors, and visitor facilities. The Multnomah Falls Lodge (built in 1915) and footpath are on the U.S. National Register of Historic Places.