I understand what you mean and think I can elaborate: if I take a holiday to a nice hotel where everything is managed for me, I'll invariably spend some time thinking about work instead of relaxing. However if I take a vacation that is more exploratory in nature and involves either physical activity (hiking in a mountainous environment for example) or going somewhere that is outside of my comfort boundaries (say, a week in the jungle of Chiapas) my mind is focused 100% on where I am.

This is a real holiday: not just letting the body take a break but the mind.