I had the same dilema last summer!
First, have fun on your vacation. Second, don't bother playing/practicing on your vacation. Third, when you get home, then you can play. I can almost guarantee your mind will view the manner of your playing differently.
The above applied to me. I thought the 10 days off from the keyboard would cause me to suffer. It didnt! I think I improved my playing from taking such a long break. The first thing after getting home and dropping my stuff off in my room was to get to the piano and play. WOAH! It was so different somehow. For one thing, with the lack of constant music in HongKong & Thailand, I de-tuned my ear to hearing the piano so when I sat down and played, I thought it sounded better playing without the dampers - the sound was crisp and clear. Another thing was that when I looked at the music, it also seemed so much clearer to me - less cluttered somehow.
But this sense of clearness soon disappeared after a few days at the piano again. Maybe it wasn't the lack of music or the 10 days off that made things clearer but just the removal of stress in a hectic lifestyle and time spent enjoying myself and learning about other cultures that cleared my mind. I'm pretty sure this was it as I felt a bit depressed when I got back home - things just seemed to petty in my affluent lifestyle. But that feeling soon disappeared, too.

I thought, "How can I live like this? There isn't a community, I don't know my neighbors, people aren't openly friendly, my family didn't seem to change after experiencing a different lifestyle than what was accustomed - they were just glad to be able to sleep in a room bigger than a walk-in closet. ..."