I know that counting carbs is new to diabetic diets in my area. We've only been using that approach at our hospital for the last few years although the calorie based ADA diets did incorporate that to some extent. My suggestion to you is to find a dietician to work with you in establishing a good dietary foundation now and by the time you leave, you will be a pro at a diabetic diet. You can even take copies of the menus to the dietician to help you with meal planning for your vacation. Best of luck to you!