Weekend away, no equipment - ideas for bodyweight exercises?

I'm at my sister's place, minding the kids whilst she and her husband are away for a couple of days. I'm missing my Friday SL5x5, but managed to sneak in an 8k run earlier. However, I'd like to do something lifting-related, to keep up some momentum.

Any suggestions? I'm thinking press-ups, maybe unladen squats (and lots of them, or is this a waste of time?) - anything else worthwhile?

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