ATMs are available in the bigger cities, but take cash if you're going anywhere more remote. Credit cards are accepted in top-end establishments.
Guesthouses You can tip around CFA500 if the service was very good.
Hotels Tipping the cleaning staff is at your discretion, but if you're very happy with the job they did, anything up to CFA1500 is reasonable.
Tours Beyond the guided tour price, if your guide has been excellent, tip them from CFA500 to CFA1000.
Taxi Since you'll mostly have to bargain down the price, tipping is not expected.