Thing is, that isn’t fun for everyone. Especially with activities chosen for you, it could be quite the opposite of fun. I’ve been subjected to “mandatory fun days” many times, and all of them have sucked hard for at least one person there (not always me, but they are always a massive waste of time for me).
I don’t actually want to be friends with my coworkers (friendly, yes; friends, no); it’s nice to have totally separate groups. No drama bleed, and people leave me alone so I can get my work done. Most jobs I’ve had, I don’t like my coworkers enough to be around them outside of job tasks, and I don’t have to. We are there to work, we didn’t choose the people we work with, and I’m not interested in using my job to replace my social life, especially since I typically have vanishingly little in common with the people with whom I work. We talk professionally about work stuff and that’s it.
Plus the work doesn’t vanish on this “day off”. It just means you have more to do the next day like any other day off, but you didn’t even get to do your own thing to cause that extra workload. Hard pass.
Need to throw in some viral stupidity like licking toilet seats and tampering with food and stuff.