Z stands for Zanzibar! The very name conjures up exotic images of sultans, spices and slaves. And when you get there, the reality does not disappoint. To spend a day in Zanzibar Town, known as Stone Town, is to be plunged into a time warp. Wandering through the narrow streets I felt as though I was in the heart of some ancient Arab town. Ninety-seven per cent of the population are Muslims, although there are also Hindus, Christians and a small group of Parsees. The muezzin's call to prayer echoes across the rooftops five times a day.