I honestly plan for a small gain (or at least a maintain), and commit to get back on track as soon as vacation is over. I also try to watch my portions and eat healthier, lower point food for breakfast and lunch, and indulge more at dinner (and with drinks). I find it easy to make good choices at breakfast and lunch, even when I’m on vacation, as there are usually eggs/omelet stations, fresh fruit, salads. But I go on vacation to enjoy the entire experience, including the food (especially if I’m at a nice resort with fine dining options), so I don’t stress it. One week won’t make a difference in the long run. It’s how we eat most of the time that matters, not the occasional holiday, vacation, special occasion restaurant meal. Etc.