I love training on holiday and have some of my best sessions when I am away...nice and relaxed and in a fresh new gym!
I wouldnt freak to much about diet tho...u still want to enjoy your holiday....try and pick up a small tub of protein there and try and stick with pork, chicken, fish, steak and rice while your there (they will have all these things on every corner of every street...it wont just be pork!)...if your worried about the chicken, stick with beef/fish/pork...
I def agree train while your on holidays...but your butt in the mornings...best start to the day when your away!!