However, once you accept these facts, Cairo has lots to offer the visitor; its main museum is an essential part of your vacation experience and its street life is a sure sign that you have come to a totally different culture.
Cairo has a lot of different attractions but they need more convincing. 
mnli hypothesis: Cairo has a lot of different attractions but they need more convincing.  premise: However, once you accept these facts, Cairo has lots to offer the visitor; its main museum is an essential part of your vacation experience and its street life is a sure sign that you have come to a totally different culture.