Just be aware that the later you start from the Portal, the more uncomfortable it will be going up the canyon in the heat with a heavy pack. On a dayhike, you're typically out of this canyon and at cooler elevations before the sun really warms things up. I've gotten away from the Portal between 9:00 and 10:00 a couple of times with an overnight pack, and I was miserable by LPL both times. Heat I can take. Weight too. The two combined suck.
The ledges above Consultation Lake are a much better camping option than the Trail Camp ghetto. Cleaner, quieter, less wind, fewer critters. You can't see these ledges from the trail, but once you begin climbing the rock staircase above the lake head a few yards to your left and peek over the side - you should find several reasonably groomed sites along the way. Some will even take tent stakes. Easiest water access is a couple of hundred yards back down the trail where the path crosses over a stream of snowmelt. It's just after you cross this stream on the ascent that you should be looking for the ledge sites.
On my Enjoyability scale of 1-10, Trail Camp is a 3 or 4 (or -1 on a really windy night), while Consultation Lake is easily an 8 or 9.
