Anytime you bring work materials, laptops , paperwork or worse keep meetings, in a neurotic attempt to 'keep up' on what should essentially be personal or vacation time.

This is most acute when you realize you get more actual work done, on "vacation" than when in the office, because nobody is interrupting you.
> Bob & Mary's workation to the Bahamas centered around both of them never leaving the WIFI hot spot of their hotel and working on and off and never seeing much of the island or doing anything away from their laptops.