My wife and I are planning to travel to Gambia next year in January. We are going to Banjul and the coast, and may spend time on the Gambia River. Is malaria something we should be worried about on our holiday and if so, in what areas is malaria most prevalent? Should we be worried about malaria when we're at the coast? Is it best to take the prophylactics for the duration of our holiday and which type is best suited to Gambia? Is there adequate treatment locally if we get sick?