Just the 1, usually a G-Shock or similar. I worry about it being stolen from the hotel room (hotel cleaners know a good opportunity when they see one...) and I don't like wearing a watch at the beach, as the heat makes them uncomfortable for me. I'd also be paranoid of sand marks.
A holiday is a time to chill out and not worry about the things you do in normal life, so a simple watch that I don't have to worry about is always my choice.