Our original plan was to camp at Serene Lake, but we got a late start and hiked too slow.  We decided to divert to Middle Rock Lake, which worked out well.  Somehow, we snagged the best camping spot on the lake and the kids got busy catching crawdads.  Our site was right next to the lake, had great views, and good access to the water.  By evening, all of the camping spots were occupied.  With 2 adults, and four boys (8, 11, 11, 16), we were easily the most obnoxious group at the lake.  One of the boys tried swimming across the lake, but we convinced him to turn around.

After setting up camp, we hiked to Upper Rock Lake, which is pretty small and did not appear to have any good camping options.  Also, there were quite a few trees down across the trail from Middle Rock to Upper Rock.  We also checked out Lower Rock Lake on our way out, which is ok, but I would not want to camp there.  The lake was warm and there where lots of tad poles.  

Of the three, Middle Rock is definitely the nicest lake, and has the best camping options.