Public toilets are very scarce – on long journeys expect to pee by the side of the road.
Take toilet paper and hand sanitiser for any non-hotel toilet.
Old-school hole-in-the-ground toilets are not unusual.
Douala and Yaoundé both have reputations for petty crime, especially in the crowded central areas.
Scams and official corruption are a way of life in Cameroon; keep your guard up and maintain a sense of humour.
It's theoretically a legal requirement to carry your passport with you at all times....