I'm an European no-Whatsapp guy and so are my friends that I go on holiday with so no issue.
Meanwhile at the last work retreat they did everything through Whatsapp and it was so relaxing to be out of the loop.
I just checked with my roommate in the morning to get the planning for the day, and I wandered as I wished.
I missed a lot of impromptu events, sure. I also missed a few official events that changed place at the last minute. I went walking on the beach instead.
And for the events I was expected to be active in, organizers just made sure that I was where I needed to be when I needed to.
So I was able to completely relax and enjoy my stay.
In the end everybody was exhausted while I was refreshed like after actual personal holiday!
Enjoy your Whatsapp!