I thought I would risk a day hike today, in spite of the rain forecast and went to Wallace Falls State Park, about 40 miles from Seattle off Hiway 2 and the little town of Gold Bar. I pulled it off, getting a little wet on the last 1/4 mile to the trailhead parking lot. It was about 10 miles round trip to Wallace Lake above the falls and a 1500' elevation gain with lots of rocks, roots, mud and even a little old snow at the top.
This is what the Western Washington lowland forests look like this time of year (about 1800 feet above sea level)
It has been raining and the snow pack is good, so the waterfalls are fantastic: