Peak Lake and Knapsack Col. Golden Lakes Basin is also really nice. And the area between Golden Lakes and Camp Lake is pretty amazing too. Lee Lake up above Middle Fork Lake also gets you a really nice picturesque view to the south looking up at Nylon Peak and the surrounding cirque. Oh yeah, there's also Deep Lake and that whole area. And there's also the area of Shadow Lake which also gets lots of crowds and traffic.
Those are all backpacking destinations and you really can't go wrong with any of them.
If you prefer car camping, you can camp in the area of Big Sandy Trailhead and still reach Cirque if the Towers OR Deep Lake via long day hikes. Green Lakes area is also very nice for car camping and day hikes.
My bucket list place for up there now though would be to get up into the Northeast section of the range and experience upper Dinwoody drainage and everything north up to Downs Mountain.