Mansa Musa traits are "Spiritual" and "Financial".
“Spiritual” means you have “No anarchy” during revolution. This means that you should change your civics and/or religion frequently (there is a general limit of 1 revolution in 5 turns however). Of course, when doing so you must take into account the effects of the chosen Civics and Religion. Temples are constructed at double speed, meaning that you should discover Priesthood and maybe think of founding several religions (discovering Polytheism is beneficial as it gives you both the Hinduism Religion and the path to Monotheism technology (with Masonry), which is required to Judaism). You should consider building missioners to spread religions, as it will lead to more happy people when switching to “free religion” civic in modern times.
“Financial” should make you research “Banking” as soon as possible, as the Banks are constructed at double speed. As you will probably have many banks it will bring you closer to the Wall Street wonder. Also, you should concentrate on terrains which produce more commerce, as you have a bonus of +1 for each square that generates 2.