Nauru is a pretty safe country over all, with no weather hazards and not much crime, but here are a few things to bear in mind:
Stonefish - take care walking in the shallows or on the reef because these nasty little things sit on the ocean floor looking exactly like the ocean floor, until you step on them, when they inject you with potentialy lethal venom! Occurrences are rare, but be on the safe side and wear soles if you stray off the sand.
Other marine nasties - sharks and jellyfish hang out here but are not usually a problem.
Be careful of dangerous currents if swimming.
Fresh water can sometimes be in very short supply in Nauru so be considerate in your usage of it. If it runs out, you have to wait until next rainfall - and that can sometimes be a very long time coming.
Walking/bike riding at night - there is no streetlighting so either make yourself seen with a torch or be very vigilant. Drink-driving can sometimes be a problem.







