Yes, isn't it amazing how differrent you react to your favorite sweets after a little time in the Zone!
I haven't been on a cruise, which I hear is uaually filled with the opportunity for endless eating, but I have been on plenty of vacations. I've been eating this way almost 9 years, and while 'm very carb sensitive and usually always stick to the Zone, vacations and Chrisrtmas are my exceptions. On vacation I Zone as much as I can at meals, but also dont' hesitate to indulge when I feel like it. You definitley feel crummy later, but sometimes it's kind of worth it. No damage is done in the long run. You come home a little bloated andweighing a few lbs more but it goes away by the end of a week or so. I just spent a week with my family at Disney World, and enjoyed myself, junk food and all!
As for how to Zone on vacation, look for eggs and oatmeal with a piece of fruit for breakfast. Caesar salads with chicken are always good for lunch or dinner. Salmon seeme to be everywhere. Also there are lots of carb conscious selections showing up on menus these days.
Have a great time on the cruise!