Was that cactus green at one point? Is it mushy? I just left my plants for six days, the temps were between 90-100 degrees during the day. I watered all my plants the day I left (watering until water came out of the drainage holes in the bottom of the pots) I didn't water them at all until the 6th day when I returned home, and I had no problems. My staghorn fern was a little wilted but bounced right back after being watered. My point is, one of the best things about succulents is they can handle some neglect every once in awhile. Unless I'm leaving for several weeks I don't let anyone touch my plants. The only instructions I left for the person who lives on my property was to not touch/water them. If your cactus isn't mushy than its probably a lighting issues. The other plants with the exception of that brown one in the long planter all look ok and if they looked different than when you left them they should bounce back. When in doubt don't water.

I have a haworthia coarctata that will turn very dark green when exposed to a lot of light. Unless it's burned, the burn spots are obvious and white. It had gotten a burn spot when I first brought it home, the burn was on a lower leaf which I was able to cover with gravel but now it's hardly noticeable.

peanut cactus? Yes im trying to recover it. The one with baby cactus on it is fine and doesn't feel mushy amd giving normal colors and babies. But others were brownning from bottom so i cut the brown parts now im hoping to recover them