Compact, sandwiched between upper and lower Robinson creek campgrounds. The last week of June the overnight temperature got down into the high-30s/lower-40s. For day-hiking, which is what we did, drive down to Annett’s Mono Village at the far end of the second lake and park in their lot at the edge of the lake. No charge for day-hiking, and this is where you’d start the trailheads up Horse Creek or to Barney Lake. I would certainly consider this campground again next time I want to visit Twin Lakes.