Mine is - DO NOT go to the building you work at. Like if you’re a retail worker, it is not wise to go to the store you work at or the restaurant. Because they see you come in shopping for whatever reason, they’ll possibly be on your ass about you being able to come in and shop but not work that day.
That would depend whether you took a day off sick or just… a day off. If it’s a day off then you can spend it however you like, but I agree it can cause awkward questions if you are off sick but are seen.