Tsunamis. Tonga is prone to tsunamis. A tsunami can occur within minutes of a nearby earthquake.
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Most visits to Tonga are trouble free. The crime rate is relatively low. However, petty crime and theft do take place. You should remain vigilant, especially at night.
Being a tropical island nation where tropical fruit is available in abundance, Tonga is a place where cocktails are extremely well-done! You'll find cocktail menus in just about any bar, restaurant or resort where fresh fruit is usually a keen component of the drink, as well as a bit of alcohol, of course!