Cougar Mountain is the westernmost of the Issaquah Alps and the largest wildland park inside the Seattle metro area — over 3,000 acres of forest, ridge trails, and forgotten coal-mine ruins. The Wilderness Creek trailhead is the standard starting point, with a moderate climb up to the Wilderness Cliffs and the Long View Peak overlooks.
The trails are mostly under tree cover, so it is a good rainy-day hike. Bears and cougars are present but rarely seen; deer are common. Pack the Green Trails map — the trail system is dense and well used.