Snoqualmie Falls
We had trouble finding the falls while driving east on I-90. If you take exit 25, there are no signs showing the way to the falls. So drive north from exit 25 on Snoqualmie Parkway. The road ends after driving through town. From there you'll see the sign to the falls indicating a left turn (west). There are additional signs along the road. You'll drive through town and find the state park on the left or south side of the road.
Exit 27 when driving west has signs the entire way.
During Spring, when we visited, the falls was in full force and spraying a stream of watery mist over the view stand. Very nice, but a bit chilly. I imagine after the snow melts in the higher elevations, the falls is not as impressive.