Establish a ritual that acts as a border between work activity and home/play activity. It can be simple or complex, depending on how much it takes to convince your brain you've made the transition. Practice the ritual religiously (it could even be a religious ritual!) You will likely find your ritual makes the transition between states of mind easier over time. I don't know why it works, but it often does. For my father taking a nap as soon as he got home from work was what helped him. I like to alter room lighting across the house as a reminder I'm in a different mode. A change of clothing can help also. Whatever works on a daily basis seems likely to work when on holiday also.