I know you are supposed to shut everything down when you go on holiday and not be contactable by man nor beast. I would like to present an alternative view....
I find it much more relaxing if I know all is well (yes, I know its my business so I am much more bought in than some) - this consists of using mobile tech for what is intended for.
check my email once over breakfast (reply in 10 words or less if needed) - be available if someone wants to / needs to talk to me and...........that's about it
this approach helps me relax better and enjoy my break much more than some self enforced purdah
works for me!