Do monkeys steal food or personal belongings from Mount Rinjani campsites?

They can, and they do. Long-tailed macaques live along the Rinjani trails and around the popular camps, and they have learned exactly what trekkers leave lying around: snacks in open tent vestibules, food wrappers in side pockets, rubbish bags tied loosely to a pole. Indonesian outdoors writers who cover this mountain warn specifically against leaving tents empty and unzipped at Plawangan, because the monkeys there have learned to enter tents and search packs, and a group returning from the sunset viewpoint to find its snack bag gone is a genuine Rinjani story, not a myth.

Understand what you are dealing with. These are not aggressive apes; they are opportunists that watch camps all day and move the moment the humans leave. They target food and anything that smells like it, and they can work a soft closure but not a fully zipped tent. Anything genuinely valuable, passports, cash, phones, is not their interest, but a bag of peanuts or a sleeve of biscuits left visible will absolutely be investigated, and a monkey defending a food find can be unpleasant.

The prevention routine is simple and we drill it with every group. Zip the tent completely closed every time you leave, even for five minutes. Keep all food, toiletries, and rubbish inside the tent or with the crew’s sealed kitchen stores, never in an outer pocket or under the fly. Never feed the monkeys, not once, because a fed monkey becomes a bold monkey for every group that camps there afterward. And carry your rubbish down rather than leaving bags at the pitch, since food-scented trash is the number one camp attractant.

Our porters keep the group’s provisions consolidated and watched, which protects the kitchen, but that is not a personal guard service for your tent, and we tell guests plainly: valuables go with you, food stays sealed, zips stay closed. Follow that routine and the monkeys remain what they should be, a photogenic part of the mountain instead of the thing that ate your breakfast.