Gorgeous hike! One of my favorite in the area. Beautiful views on the way up and down. Break in walking through the woods from time to time, you come out in a pretty little field with wild flowers. Streams and lots of wild life.
And of course, Blue Lake is just absolutely stunning. All the photos posted do not do it any justice. It's also absolutely freezing, lol. You gotta jump in though, it's almost a right of passage. Don't jump in the deep end though! Even in mid summer you can get hypothermia.
Advice: This hike also connects to a climbers hike, so the parking lot gets filled with climbers that sleep in their cars overnight, so the parking is dicey. Go early in the morning. It will still be tough to find parking, but better than mid day.