Olympic National Park
As for bikes, all roads, gravel and otherwise, are open to mountain biking. The most popular ride is the gravel road to the hot springs . Plus, you get a trail not open to internal combustion—the Spruce Railroad Trail, a designated bike trail near Lake Crescent. The Spruce Railroad Trail connects the North Shore and Lyre River trailheads. Much of this relatively flat four-mile (each way) trail runs on or adjacent to the World World I Spruce Railway bed and offers excellent Lake Crescent views.
All other trails are hikers only. Oh well. There's always more biking at Olympic National Forest , next door.
Details mentioned in this article were accurate at the time of publication