Two magnificent water falls pretty close outside of Bellevue and Issaquah. It is located on I-90. Turn right on 468th Avenue Southeast, drive about a half-mile, then turn left on Southeast 159th Street. Continue a half-mile to road end, parking area and facilities, elevation 600 feet. The hike to the falls is about 2.6 miles round trip.
I love this hike because its so conveniently located for us. It is a little work out, though. Not too intense, but not for the faint of heart.
Twin Falls State Park in Washington