Don’t go from winter weather into the steaming tropics without a rest before and after. Minimize jet lag by setting your watch to local time at your destination as soon as you board the flight. Westbound flights into the South Pacific from North America or Europe are less jolting since you follow the sun and your body gets a few hours extra sleep. On the way home you’re moving against the sun and the hours of sleep your body loses cause jet lag. Airplane cabins have low humidity, so drink lots of juice or water instead of carbonated drinks, and don’t overeat in-flight. It’s also wise to forgo coffee, as it will only keep you awake, and alcohol, which will dehydrate you.
Scuba diving on departure day can give you a severe case of the bends. Before flying there should be a minimum of 12 hours surface interval after a nondecompression dive and a minimum of 24 hours after a decompression dive. Factors contributing to decompression sickness include a lack of sleep and/or the excessive consumption of alcohol before diving.
If you start feeling seasick onboard a ship, stare at the horizon, which is always steady, and stop thinking about it. Anti-motion-sickness pills are useful to have along; otherwise, ginger helps alleviate seasickness. Travel stores sell acubands that find a pressure point on the wrist and create a stable flow of blood to the head, thus miraculously preventing seasickness!
Frequently the feeling of thirst is false and only due to mucous membrane dryness. Gargling or taking two or three gulps of warm water should be enough. Keep moisture in your body by having a hot drink like tea or black coffee, or any kind of slightly salted or sour drink in small quantities. Salt in fresh lime juice is remarkably refreshing.
The tap water is safe to drink in the main towns of the South Pacific, but ask first elsewhere. If in doubt, boil it or use purification pills. Tap water that is uncomfortably hot to touch is usually safe. Allow it to cool in a clean container. Don’t forget that if the tap water is contaminated, the local ice will be too. Avoid brushing your teeth with water unfit to drink, and wash or peel fruit and vegetables if you can. Cooked food is less subject to contamination than raw.