I have worked at summer camps most years since 2008.
The language immersion kind though. So kids come from various different countries, have English lessons in the morning, and then various activities and trips in the afternoon and evening.
You basically have no life for about 3 weeks, but leave with a couple of thousand pounds, and if you lived in, all meals provided. (The food varies but is usually ok).
I’m there as a teacher/sometimes also pastoral staff, and they also usually get local university students in for the sports and outdoorsy stuff and to help make up the numbers on daytrips.
You get very good at counting people on and off buses.