[Leggibone]

Set the expectations before you go - if one family eats/drinks more then the other let them know yourll be doing separate bills (so no hard feelings either way)
If you have a day plan/schedule, let them know what you intend to do & if they want to they can join, if they want to do their own thing don’t let it bother you (I know some families are full on parks, some are half way ect). Make sure you do have some of your own family time, so maybe it’s a meal, maybe it’s an experience, maybe it’s a few whole days.
And remember with things like villa mess with ect. It’s only a holiday, you can go back to your way stuff once holiday is over, but there’s no point letting dishes or toilet seats ruin a holiday or friendship