Mayotte is a malaria-infested zone. Consult your physician for anti-malaria medecine, and pile on mosquito repellent.
respect
90% of the population is Muslim, following a very tolerant Islam. Say hello to people you will cross while hiking, always smile, and you will be respected.
talk
French is the official language and is spoken by roughly 35% of the population. More commonly-spoken are Mahorian a dialect of Swahili and Malagasy.