Make sure that if you are diabetic and you are going to be traveling by airplane, that you drink a lot of water. The cabin's air is a lot drier than normal air is and it can cause thirst, especially in those that have diabetes. You should be able to pass through airport security with water bottles if you can prove that you have diabetes.
Watch out for liquid sugars. It is just as important for diabetics to watch what they drink as it is to watch what they eat. High-fructose corn syrup found in soft drinks is especially harmful to diabetics, and while fruit juices can be healthy, they can also cause a dangerous spike in blood sugar and should be consumed in moderation. Water is the best choice when you are thirsty, followed by unsweetened beverages.
If you have laser eye therapy to correct eye damage caused by your diabetes, be careful how you exercise for at least a month after your surgery. In order to maximize the chances of full recovery, don't do exercises that involve straining or increase of eye pressure, which could stress the blood vessels that were repaired. That means no weight lifting underwater diving or exercise routines that involve holding your breath.