Cougar Mountain Regional Wildland Park is one of the best reminders that Bellevue sits on the edge of real forest, not just suburbs and office towers. The park protects wooded hills, ravines, wetlands, and old mining areas, with a large trail network that ranges from easy loops to longer, hillier hikes.
It is a strong half-day escape for visitors with a car, especially if you want Pacific Northwest forest without driving deep into the Cascades. Trailheads vary, so choose your route before going, and expect mud after rain. The park pairs naturally with nearby Issaquah and the broader "Issaquah Alps" hiking area.