Davao is the largest city on the Philippines' second-largest island, Mindanao. It has a huge land area, and the inhabitants like to think of it as one of the most crime-free large cities in the Philippines.
The elected officials have been accused of encouraging vigilantism and death squads. Whatever the truth of these accusations, it's certainly true that, as a visitor, you're certainly less likely to be the victim of robbery or petty larceny than most similar size cities in the Americas with the exception of Canada.
Davao is renowned for its durian and pomelo. Durian is definitely an acquired taste, but those who do end up liking it will swear that the bad smell is worth it. Pomelo is a citrus fruit that most closely resembles a grapefruit and s quite common in South East Asia. Beware of bringing durian inside airplanes, hotels and other establishments. They may have strict regulations on allowing durian inside and some do not allow durian to be brought in at all.