Went in the winter time for my birthday and it was breathtaking! It was awesome cause the lake was frozen over and we were able to walk to the middle of the lake. Something you definitely couldn't do in Summer...regardless though, Anand said it was beautiful in the Summer as well!
Beautiful simple, fast hike. Get a great view of Red Rocks from afar, and a great view of Denver from afar. Can be a little challenging at parts, but not too bad.