Do not use your vacation as an excuse to stray from this WOE or else you'll return from Cancun with more than a tan. I do not know what conveniences you will have in your hotel room and since you are traveling to Mexico, it'll be more difficult to find LC products at the supermarket. Like Alina said, eat absolutely safe items. Will the hotel you are staying at (or one nearby) have a big buffet dinner? I find big buffets are very LC-friendly. You just choose to leave the refined sugar, flour, and starches off your plate. For lunch, most places have salads. For breakfast, simple eggs and bacon should do the trick. Maybe a local store will have small bags of nuts suitable for snacks. Maybe, you should bring a bunch of small, empty zip-locs with you, so if you do find good snacks, you can put them in them. Also, you may want to pack some LC bars in your suitcase for snacks. Have a great time. Happy LCing!