If you have access to a car, the best place to hike is the Columbia River Gorge, which is a 45 minute drive from Portland. The Gorge offers dozens of trails and all different skill levels. On a hot summer day, you cannot go wrong hiking the scenic Oneonta Falls. Another close second is Angel’s rest. If you do not have access to a car, Forest Park and Washington Park both offer scenic hikes and are much closer to the city.