What a great area to camp in. Andy has already written a report so I'll just add my two cents. There are no facilities to be had, so bring your trowel if you're staying overnight. Running water was plentiful during our trip and there are some large tarns which will be available all summer if all else fails.
There is a lot of exploring potential here, much of it of the scrambling variety where you take a likely-looking route and go up. We did Illal Peak this way and saw a couple summit Spiral Peak (which appears from a distance like it might be difficult) using the same method. There is a horse trail running through some of this area and we used it to head most of the way towards Spiral Peak and on another day to circumnavigate Jim Kelly Peak, both trips being very worthwhile.
There are two large and excellent swimming lakes in the area, one at the foot of Illal Peak (south side) and another northwest of Jim Kelly Peak, along the horse trail. There are two lakes along the Jim Kelly circumnavigation but only one is worthwhile, the other being shallow, muddy and skuzzy.
Aside from the horse trail, there are no trails once you reach the meadow area. Bring your map and compass.