I know many people feel that when they are on vacation they can eat whatever they want. But just like the credit card bill for all those personal indulgences, excessive calories stick around too.
When ordering out on vacation, same as at home, you want to look for the key words "baked," "broiled," or "grilled." This means your lean protein (I am assuming that you will be ordering a lean protein like chicken or fish) and veggie side will not loaded with extra calories and fat. I know this tip seems obvious, but I am going to remind you: Avoid fried food. If your main dish is not so extravagant, then splitting a dessert might be an indulgence you can afford.
Fit's Tip: Since you are on vacation and not in a rush, why not walk to the restaurant or take a stroll after dinner?