It was overcast the day we went, so we didn't get to see much of the turquoise waters, but it was still stunning. The glacier flour / mud can get pretty unstable - one of my shoes sunk in pretty deep, and we all had a lot of mud to scrape off our shoes before getting back into our rental car.
You can take the scenic drive along the lake, go on hikes, camp, and even canoe and fish on the lake.