Stay safe & healthy
Samoa is a generally safe destination. Crime rates are low and people are very helpful and friendly. Items do, sometimes, get stolen. With sensible precautions, however, the threat of this happening should be minimal.
Free roaming dogs can be a safety problem in the capital Apia. The Government of Samoa (GoS) passed the Canine Control Act in 2013 as an initial step toward addressing dog management. Most dogs ignore you and don't see you as a threat if you ignore them.
Samoa is a malaria free zone. However, there are occasional outbreaks of dengue fever and (since 2014) chikungunya, so precautions should be taken such as using mosquito nets and insect repellent. Note that the mosquito that transmits dengue normally bites during the day.
Drink bottled water. It's cheap and readily available.
There are no known poisonous animals or insects on land, although centipedes can give you a very painful bite. In the water beware of purple cone shells, sea urchins, fire coral, etc. If not using fins, wearing footwear while snorkelling is highly recommended.
Some travellers have reported a violent allergic reaction to the ceremonial drink kava. Symptoms include a very obvious rash and swelling to the neck and face area, sweating and discomfort. Medical attention should be sought immediately and a prescription for Prednisolone usually does the trick. It takes from 12 o 24 hours for the effects to noticeably subside.
There are two hospitals in Apia and one on Savaii at Tuasivi, a couple of miles north of the ferry wharf at Salelologa.