Quick cache along the East Lake Sammamish Trail accessible by going through the tunnel from the trail. Keep on going South on the trail and you will reach Sammamish Landing, Public Bathrooms, Docks, and Water Fountains are available. Placed by a kid under adult supervision. Please, leave it the way you found it. No need to enter the woods.
By the way, there used to be a cache only a couple feet away from the location of this cache: GC23ZQJ East Lake Sammamish Nature Trail. It was under the walkway and that walkway got renovated (it was also in the rock wall near the cache).
Congratulations to geobassethound for the FTF!