Hi there,
Oregon has many popular hiking trails such as the Mt Hood Wilderness, the Mt Jefferson Wilderness, the Three Sister Wilderness, the Diamond Peak Wilderness, the Mt Thielsen wilderness and the Sky Lakes Wilderness which cut along the Pacific Crest Trail.
The Oregon Coast trail is another great option for
hiking as it extends the entire length of the
Oregon Coast, stretching into the shore line and into the mountains and cliffs.
Some of the popular spots along the Oregon Trail where you can hike are the Boardman State Park and the Oregon Dunes National Recreation Area where the hiking trail stretches for over 4 miles.
The Clackamas River Trail is also a great hiking stretch and popular due to its accessibility from the main cities and towns.
Hope this helps
VacationBuddy