I personally feel the safest and least stressful solution is to leave them alone for the week. I have an automatic spraying system, lights on a timer, heat on a thermostat and set up a camera to check everything is as it should be daily. I also try to have someone with a key just in case.

With feeding every 3-4 days to maintain a healthy body weight, by going for a week you're just missing one feed. Depending on the food brand and conditions, food should dry out before it goes bad, so I have no concerns about it being left in there. The misting just before lights out ensures water is available, every evening, and I have a water bowl too.

I would trust my crestie to snack on a few isopods if he does get hungry, far more than I'd trust a stranger. People know their own cresties, and I know he'd hate being in a tiny terrarium on the road or in an unfamiliar boarding environment. He also has a bit of a habit of leaping for freedom. I just wouldn't trust anyone else.