If you are energetic, at the back end of the lake you can climb up the trail to the peak. I went about half way but didn't have enough water with me and was trying to tackle a rock face climb with I was not set up for. There is a trail to the right of that (about half way up) that is a better bet. Several people told me that the hike up to the top was about an hour. I was at that half way point in about 20-25 minutes so that sounds about right. Was very hot and dusty when I went - middle of the day. Would be better on a cooler day or earlier or later in the day.
Here are a few pics from the day:
View arriving at Rawson Lake:
Yvonne walking the trail at the top:
Snow cooling off my hot feet after the climb:
This from half way up at the back of Rawson Lake:
Later in the day the water got very still:
My evening cigar: