If you're out of shape, this is a workout. (If you're in great shape, I saw people running this trail -- up and down!) The lake is small and peaceful.
There is an excellent overlook of Puget Sound at the view point -- which is a spur from the main trail.
Washington Trails - Fragrance Lake
Fitbit scored it as about 110 flights of stairs, and 4 miles. It's steep. Definitely one to do again.