Meysan Lake Trail is a beautiful under used trail but it is a mosquito factory...most of the camp sites are in or around a meadow.
Last year, I fell in love Cottonwood Pass-Trail Pass Loop. We based at Chicken Spring Lake, did Cirque our first day in and looped out and did Trail Peak. Cirque isn't all that hard to figure out...go down the PCT until you can see Cirque Peak on your right then head for it. Trail Peak is relatively easy get. look at your map for the easiest route up from the trail. We did it in June when there was still some snow around on Trail Peak but none on Cirque...just some snow fields along the way.
You should have problems getting bp permits for either. If Cottonwood Pass is a full, just go up Trail Pass Trail where there are no quotas.
Langley is an easy get via Army Pass made somewhat harder by using New Army Pass. We usually head up to a Long Lake basecamp via the South Fork Trail...it's on USGS map and the message board at the CL/NAP Trailhead but not the Tom Harrison Map. Just go ~180' past the SF crossing and look for a trail on your left. Taking this will eliminate the roller coaster ride and most of horses... However, there is a big climb to the South Fork Lake Basin and a cross country trip through the basin to meet up with the NAP Trail just before your reach Long Lake...the best camping there is at the lake's west near the outlet from High Lake.
BD - message me if you need more info.
