Washington is a gorgeous, gorgeous state (you'll likely find no objections to that by anyone who has visited). During our time in the state, we found so many stunning spaces both in Seattle and out in nature that had us in awe almost everywhere we went.
But one trail stuck out as being the most stunning above all others, and that is The Summit Lake Trail near Carbonado- about two hours outside of Seattle and just a stone's throw away from Mount Rainier.
While you may not be summiting the famous mountain in this one, it does command a pretty impressive view of the mountaintop all the same.
But, as a word of warning, you're going to want to have an SUV to reach the trailhead- the drive in is really the worst part!